67-21/LK2C-BX5670B3B6B2/2T(ARW) - EVERLIGHT ELECTRONICS

FN6391 Rev 3.00 Page 1 of 14

October 15, 2015

FN6391

Rev 3.00

October 15, 2015

ISL9000A

Dual LDO with Low Noise, Very High PSRR and Low IQ

DATASHEET

ISL9000A is a high performance dual LDO capable of sourcing

300mA current from each output. It has a low standby current

and very high PSRR and is stable with output capacitance of

1µF to 10µF with ESR of up to 200m.

The device integrates an individual Power-On-Reset (POR)

function for each output. The POR delay for VO2 can be

externally programmed by connecting a timing capacitor to the

CPOR pin. The POR delay for VO1 is internally fixed at

approximately 2ms. A reference bypass pin is also provided for

connecting a noise filtering capacitor for low noise and high-

PSRR applications.

The quiescent current is typically only 42µA with both LDO’s

enabled and active. Separate enable pins control each

individual LDO output. When both enable pins are low, the

device is in shutdown, typically drawing less than 0.1µA.

Several combinations of voltage outputs are standard. Output

voltage options for each LDO range from 1.5V to 3.3V. Other

output voltage options may be available upon request.

Features

• Integrates two 300mA high performance LDOs

• Excellent transient response to large current steps

• ±1.8% accuracy over all operating conditions

• Excellent load regulation: < 0.1% voltage change across full

range of load current

• Low output noise: typically 30µVRMS @ 100µA (1.5V)

• Very high PSRR: 90dB @ 1kHz

• Extremely low quiescent current: 42µA (both LDOs active)

• Wide input voltage capability: 2.3V to 6.5V

• Low dropout voltage: typically 200mV @ 300mA

• Stable with 1µF to 10µF ceramic capacitors

• Separate enable and POR pins for each LDO

• Soft-start and staged turn-on to limit input current surge

during enable

• Current limit and overheat protection

• Tiny 10 Ld 3mmx3mm DFN package

• -40°C to +85°C operating temperature range

• Pb-free (RoHS compliant)

Applications

• PDAs, Cell Phones and Smart Phones

• Portable Instruments, MP3 Players

• Handheld Devices including Medical Handheld

FIGURE 1. TYPICAL APPLICATION

C1, C4, C5: 1µF X5R CERAMIC CAPACITOR

C2: 0.1µF X7R CERAMIC CAPACITOR

ISL9000A

VIN

EN1

EN2

CBYP

CPOR

VO1

VO2

POR2

POR1

GND

VIN (2.3 TO 6.5V)

ENABLE1

ENABLE2

VO1

VO2

RESET1

RESET2

C1 C2 C3 C4 C5

C3: 0.01µF X7R CERAMIC CAPACITOR

OFF

(200ms DELAY,

C3 = 0.01µF)

(2ms DELAY)

VO2 TOO LOW

VO2 OK

VO1 TOO LOW

VOUT1 OK

ISL9000A

FN6391 Rev 3.00 Page 2 of 14

October 15, 2015

Block Diagram

VO2

LDO

ERROR

AMPLIFIER

IS1 1VQEN1

LDO-1

LDO-2

POR

COMPARATOR

VOK1

POR1

VREF

TRIM

VIN

VO1

VO2

POR2

POR1

GND

EN2

EN1 CONTROL

LOGIC POR2

DELAY

POR1

DELAY

VOLTAGE

REFERENCE

GENERATOR

BANDGAP AND

TEMPERATURE

SENSOR

UVLO

VOK2

VOK1

1.00V

0.94V

0.90V

IS1

IS2

QEN1

QEN2

VO1

VO2

100k100k

CPOR

CBYP

VO1

~1.0V

VOK2

POR2

ISL9000A

FN6391 Rev 3.00 Page 3 of 14

October 15, 2015

Pin Configuration

ISL9000A

(10 LD 3X3 DFN)

TOP VIEW

VIN

EN1

EN2

CBYP

CPOR

VO1

VO2

POR2

POR1

GND

Pin Descriptions

NUMBER

NAME TYPE DESCRIPTION

1 VIN Analog I/O Supply Voltage/LDO Input:

Connect a 1µF, X5R ceramic capacitor to GND.

2 EN1 Low Voltage Compatible

CMOS Input

LDO-1 Enable.

3 EN2 Low Voltage Compatible

CMOS Input

LDO-2 Enable.

4 CBYP Analog I/O Reference Bypass Capacitor Pin:

Optionally connect capacitor of value 0.01µF to 1µF between this pin and GND to tune in the

desired noise and PSRR performance.

5 CPOR Analog I/O POR2 Delay Setting Capacitor Pin:

Connect a capacitor between this pin and GND to delay the POR2 output release after LDO-2

output reaches 94% of its specified voltage level. (200ms delay per 0.01µF).

6 GND Ground GND is the connection to system ground. Connect to PCB Ground plane.

7POR1

Open Drain Output (1mA) Open-drain POR Output for LDO-1 (active-low):

Internally connected to VO1 through 100k resistor.

8POR2

Open Drain Output (1mA) Open-drain POR Output for LDO-2 (active-low):

Internally connected to VO2 through 100k resistor.

9VO2

Analog I/O LDO-2 Output:

Connect capacitor of value 1µF to 10µF to GND (1µF recommended).

10 VO1 Analog I/O LDO-1 Output:

Connect capacitor of value 1µF to 10µF to GND (1µF recommended).

ISL9000A

FN6391 Rev 3.00 Page 4 of 14

October 15, 2015

Ordering Information

PART NUMBER

(Notes 1, 3)

PART

MARKING

VO1 VOLTAGE

(V) (Note 2)

VO2 VOLTAGE

(V) (Note 2)

TEMP RANGE

(°C)

PACKAGE

(Pb-Free)

PKG

DWG. #

ISL9000AIRNNZ DEYA 3.3 3.3 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRNJZ DEWA 3.3 2.8 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRNFZ DEVA 3.3 2.5 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRNCZ (No longer available,

recommended replacement: ISL9000AIRNJZ)

DETA 3.3 1.8 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRMNZ DESA 3.0 3.3 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRMMZ (No longer available,

recommended replacement: ISL9000AIRMGZ-T)

DERA 3.0 3.0 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRMGZ DEPA 3.0 2.7 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRLLZ DENA 2.9 2.9 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRKNZ (No longer available,

recommended replacement: ISL9000AIRKCZ-T)

DELA 2.85 3.3 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRKKZ DEKA 2.85 2.85 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRKJZ DEJA 2.85 2.8 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRKFZ DEHA 2.85 2.5 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRKPZ (No longer available,

recommended replacement: ISL9000AIRKCZ-T)

DEMA 2.85 1.85 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRKCZ DEGA 2.85 1.8 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRJNZ DEEA 2.8 3.3 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRJMZ (No longer available,

recommended replacement: ISL9000AIRJBZ-T)

DEDA 2.8 3.0 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRJRZ (No longer available,

recommended replacement: ISL9000AIRJNZ-T)

DEFA 2.8 2.6 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRJCZ (No longer available,

recommended replacement: ISL9000AIRJBZ-T)

DECA 2.8 1.8 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRJBZ DEBA 2.8 1.5 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRFJZ DDVA 2.5 2.8 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRFDZ DDTA 2.5 2.0 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRFCZ DDSA 2.5 1.8 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRCJZ DDRA 1.8 2.8 -40 to +85 10 Ld 3x3 DFN L10.3x3C

ISL9000AIRCCZ DDPA 1.8 1.8 -40 to +85 10 Ld 3x3 DFN L10.3x3C

NOTES:

1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details on reel specifications.

2. For other output voltages, contact Intersil Marketing.

3. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte

tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil

Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.

ISL9000A

FN6391 Rev 3.00 Page 5 of 14

October 15, 2015

Evaluation Board Ordering Information

PART

NUMBER

VO1 VOLTAGE

(V)

VO2 VOLTAGE

(V)

ISL9000AIRNJZ-EVZ 3.3 2.8

ISL9000AIRNFZ-EVZ 3.3 2.5

ISL9000AIRMNZ-EVZ 3.0 3.3

ISL9000AIRMGZ-EVZ 3.0 2.7

ISL9000AIRKKZ-EVZ 2.85 2.85

ISL9000AIRKJZ-EVZ 2.85 2.8

ISL9000AIRKFZ-EVZ 2.85 2.5

ISL9000AIRKCZ-EVZ 2.85 1.8

ISL9000AIRJNZ-EVZ 2.8 3.3

ISL9000AIRJBZ-EVZ 2.8 1.5

ISL9000AIRFJZ-EVZ 2.5 2.8

ISL9000AIRFDZ-EVZ 2.5 2.0

ISL9000AIRFCZ-EVZ 2.5 1.8

ISL9000AIRCCZ-EVZ 1.8 1.8

ISL9000A

FN6391 Rev 3.00 Page 6 of 14

October 15, 2015

Absolute Maximum Ratings Thermal Information

Supply Voltage (VIN). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+7.1V

VO1, VO2 Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +3.6V

All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VIN + 0.3)V

Recommended Operating Conditions

Ambient Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . -40°C to +85°C

Supply Voltage (VIN). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3V to 6.5V

Thermal Resistance (Notes 4, 5) JA (°C/W) JC (°C/W)

10 Ld 3x3 DFN Package . . . . . . . . . . . . . . . 52.8 11

Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C

Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C

Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C

Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below

http://www.intersil.com/pbfree/Pb-FreeReflow.asp

CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product

reliability and result in failures not covered by warranty.

NOTES:

4. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech

Brief TB379.

5. For JC, the “case temp” location is the center of the exposed metal pad on the package underside.

Electrical Specifications Unless otherwise noted, all parameters are guaranteed over the operational supply voltage and temperature

range of the device as follows: TA = -40°C to +85°C; VIN = (VO + 0.5V) to 6.5V with a minimum VIN of 2.3V; CIN = 1µF; CO = 1µF; CBYP = 0.01µF;

CPOR = 0.01µF. Boldface limits apply over the operating temperature range, -40°C to +85°C.

PARAMETER SYMBOL TEST CONDITIONS

MIN

(Note 8) TYP

MAX

(Note 8) UNITS

DC CHARACTERISTICS

Supply Voltage VIN 2.3 6.5 V

Ground Current Quiescent condition: IO1 = 0µA; IO2 = 0µA

IDD1 One LDO active 25 32 µA

IDD2 Both LDO active 42 52 µA

Shutdown Current IDDS @ +25°C 0.1 1.0 µA

UVLO Threshold VUV+ 1.9 2.1 2.3 V

VUV- 1.6 1.8 2.0 V

Regulation Voltage Accuracy Initial accuracy at VIN = VO + 0.5V, IO = 10mA, TJ = +25°C -0.7 +0.7 %

VIN = VO + 0.5V to 5.5V, IO = 10µA to 300mA, TJ = +25°C -0.8 +0.8 %

VIN = VO + 0.5V to 5.5V, IO = 10µA to 300mA, TJ = -40°C to +125°C -1.8 +1.8 %

Maximum Output Current IMAX Continuous 300 mA

Internal Current Limit ILIM 350 475 600 mA

Dropout Voltage (Note 7) VDO1 IO = 300mA; VO  2.5V 300 500 mV

VDO2 IO = 300mA; 2.5V  VO  2.8V 250 400 mV

VDO3 IO = 300mA; VO > 2.8V 200 325 mV

Thermal Shutdown

Temperature

TSD+ 145 °C

TSD- 110 °C

AC CHARACTERISTICS

Ripple Rejection (Note 6) IO = 10mA, VIN = 2.8V(min), VO = 1.8V, CBYP = 0.1µF

@ 1kHz 90 dB

@ 10kHz 70 dB

@ 100kHz 50 dB

Output Noise Voltage (Note 6) IO = 100µA, VO = 1.5V, TA = +25°C, CBYP = 0.1µF

BW = 10Hz to 100kHz

30 µVRMS

ISL9000A

FN6391 Rev 3.00 Page 7 of 14

October 15, 2015

DEVICE START-UP CHARACTERISTICS

Device Enable Time tEN Time from assertion of the ENx pin to when the output voltage

reaches 95% of the VOx(NOM)

250 500 µs

LDO Soft-Start Ramp Rate tSSR Slope of linear portion of LDO output voltage ramp during start-up 30 60 µs/V

EN1, EN2 PIN CHARACTERISTICS

Input Low Voltage VIL -0.3 0.5 V

Input High Voltage VIH 1.4 VIN +

0.3

Input Leakage Current IIL, IIH 0.1 µA

Pin Capacitance CPIN Informative 5 pF

POR1, POR2 PIN CHARACTERISTICS

POR1, POR2 Thresholds VPOR+ As a percentage of nominal output voltage 91 94 97 %

VPOR- 87 90 93 %

POR1 Delay tP1LH 1.0 2.0 3.0 ms

tP1HL 25 µs

POR2 Delay tP2LH CPOR = 0.01µF 100 200 300 ms

tP2HL 25 µs

POR1, POR2 Pin Output Low

Voltage

VOL @ IOL = 1.0mA 0.2 V

POR1, POR2 Pin Internal

Pull-Up Resistance

RPOR 78 100 180 k

NOTES:

6. Limits established by characterization and are not production tested.

7. VOx = 0.98*VOx(NOM); Valid for VOx greater than 1.85V.

8. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization

and are not production tested.

Electrical Specifications Unless otherwise noted, all parameters are guaranteed over the operational supply voltage and temperature

range of the device as follows: TA = -40°C to +85°C; VIN = (VO + 0.5V) to 6.5V with a minimum VIN of 2.3V; CIN = 1µF; CO = 1µF; CBYP = 0.01µF;

CPOR = 0.01µF. Boldface limits apply over the operating temperature range, -40°C to +85°C. (Continued)

PARAMETER SYMBOL TEST CONDITIONS

MIN

(Note 8) TYP

MAX

(Note 8) UNITS

VPOR+ VPOR+

VPOR-

<tP1HL

tP2LH

tP1LH tP1HL

tP2HL

<tP2HL

VO1

VO2

POR1

POR2

EN2

tEN

VPOR-

FIGURE 2. TIMING PARAMETER DEFINITION

EN1

ISL9000A

FN6391 Rev 3.00 Page 8 of 14

October 15, 2015

Typical Performance Curves

FIGURE 3. OUTPUT VOLTAGE vs INPUT VOLTAGE (3.3V OUTPUT) FIGURE 4. OUTPUT VOLTAGE CHANGE vs LOAD CURRENT

FIGURE 5. OUTPUT VOLTAGE CHANGE vs TEMPERATURE FIGURE 6. OUTPUT VOLTAGE vs INPUT VOLTAGE (3.3V OUTPUT)

FIGURE 7. OUTPUT VOLTAGE vs INPUT VOLTAGE (2.8V OUTPUT) FIGURE 8. DROPOUT VOLTAGE vs LOAD CURRENT

OUTPUT VOLTAGE, VO (%)

INPUT VOLTAGE (V)

-0.6

-0.2

0.2

0.6

-0.8

3.8 4.2 6.25.8 6.63.4 4.6 5.0 5.4

-0.4

0.0

0.4

0.8

VO = 3.3V

+85°C

-40°C

+25°C

ILOAD = 0mA

0.04

0.06

-0.06

-0.10 100 200 300 4000

LOAD CURRENT - IO (mA)

OUTPUT VOLTAGE CHANGE (%)

-0.02

0.00

0.02

0.08

0.10

-0.04

-0.08

50 150 250 350

VIN = 3.8V

VO = 3.3V

+85°C

-40°C

+25°C

0.04

0.06

-0.06

-0.10

-10 20 50 110-40

TEMPERATURE (°C)

OUTPUT VOLTAGE CHANGE (%)

-0.02

0.00

0.02

0.08

0.10

-0.04

-0.08

-25 5 35 8065 95 125

VIN = 3.8V

VO = 3.3V

ILOAD = 0mA

OUTPUT VOLTAGE, VO (V)

INPUT VOLTAGE (V)

3.0

3.1

3.2

3.3

3.4

2.9

2.8 3.1 3.6 4.1 4.6 5.1 6.15.6

IO = 300mA

IO = 150mA

IO = 0mA

VO = 3.3V

6.5

2.5

2.6

2.7

2.8

2.9

2.4

2.3

2.63.13.64.14.65.1 6.1

INPUT VOLTAGE (V)

OUTPUT VOLTAGE, VO (V)

5.6

IO = 0mA

IO = 300mA

VO = 2.8V

IO = 150mA

6.5

200

250

300

350

150

100

50 100 150 200 250 300 350 4000

OUTPUT LOAD (mA)

DROPOUT VOLTAGE, VDO (mV)

VO = 2.8V

VO = 3.3V

ISL9000A

FN6391 Rev 3.00 Page 9 of 14

October 15, 2015

FIGURE 9. DROPOUT VOLTAGE vs LOAD CURRENT FIGURE 10. GROUND CURRENT vs INPUT VOLTAGE

FIGURE 11. GROUND CURRENT vs LOAD FIGURE 12. GROUND CURRENT vs TEMPERATURE

FIGURE 13. POWER-UP/POWER-DOWN FIGURE 14. POWER-UP/POWER-DOWN WITH POR SIGNALS

Typical Performance Curves (Continued)

200

250

300

350

150

100

50 100 150 200 250 300 350 4000

OUTPUT LOAD (mA)

DROPOUT VOLTAGE, VDO (mV)

VO = 3.3V

+85°C +25°C -40°C

25 4.0 5.0 6.5

INPUT VOLTAGE (V)

GROUND CURRENT (µA)

3.0 3.5 4.58 5.5 6.0

IO(BOTH CHANNELS) = 0µA

VO1 = 3.3V

VO2 = 2.8V

-40°C

+25°C

+125°C

200

160

100

50 100 150 200 250 4000

LOAD CURRENT (mA)

GROUND CURRENT (µA)

350300

VO1 = 3.3V

VIN = 3.8V

VO2 = 2.8V

120

140

180

+85°C

-40°C

+25°C

-10 20 50 110-40

TEMPERATURE (°C)

GROUND CURRENT (µA)

-25 5 35 8065 95 125

VIN = 3.8V

VO = 3.3V

ILOAD = 0µA

BOTH OUTPUTS ON

1234567 10

TIME (s)

VOLTAGE (V)

VO2

VO1

VIN

VO1 = 3.3V

VO2 = 2.8V

IL1 = 300mA

IL2 = 300mA

1.5

2.0

2.5

3.0

1.0

0.5

0.5 1.0 1.5 2.0 2.5 3.0 3.5 5.00

TIME (s)

VOLTAGE (V)

4.0 4.5

POR1

POR2

VO2

3.5 VO1 = 3.3V

VO2 = 2.8V

IL1 = 300mA

IL2 = 300mA

CPOR = 0.1µF

VO1

ISL9000A

FN6391 Rev 3.00 Page 10 of 14

October 15, 2015

FIGURE 15. TURN-ON/TURN-OFF RESPONSE FIGURE 16. LINE TRANSIENT RESPONSE (3.3V OUTPUT)

FIGURE 17. LINE TRANSIENT RESPONSE (2.8V OUTPUT) FIGURE 18. LOAD TRANSIENT RESPONSE

FIGURE 19. PSRR vs FREQUENCY FIGURE 20. SPECTRAL NOISE DENSITY vs FREQUENCY

Typical Performance Curves (Continued)

100 200 300 400 500 600 700 8000

TIME (µs)

VO1 (V)VEN (V)

VO1 = 3.3V

VIN = 5.0V

IL1 = 300mA

CL1, CL2 = 1µF

CBYP = 0.01µF

900 1000

VO2 (10mV/DIV)

IL2 = 300mA

VO2 = 2.8V

400µs/DIV

VO = 3.3V

ILOAD = 300mA

3.6V

4.3V

10mV/DIV

CLOAD = 1µF

CBYP = 0.01µF

VIN (1V/DIV), 3.6V TO 4.2V

LINE TRANSIENT

VOx (10mV/DIV)

400µs/DIV

VO = 2.8V

ILOAD = 300mA

3.5V

4.2V

10mV/DIV

CLOAD = 1µF

CBYP = 0.01µF

VOx (10mV/DIV)

VIN (1V/DIV), 3.5V TO 4.2V

LINE TRANSIENT

100µs/DIV

VO (25mV/DIV)

300mA

100µA

VIN = 2.8V

VO = 1.8V

ILOAD (200mA/DIV)

0.1 1k 10k 100k 1M

FREQUENCY (Hz)

100

PSRR (dB)

VIN = 3.6V

VO = 1.8V

IO = 10mA

CBYP = 0.1µF

CLOAD = 1µF

SPECTRAL NOISE DENSITY (nV/Hz)

1000

100

0.1

10 100 1k 10k 100k 1M

FREQUENCY (Hz)

VIN = 3.6V

VO = 1.8V

ILOAD = 10mA

CBYP = 0.1µF

CIN = 1µF

CLOAD = 1µF

ISL9000A

FN6391 Rev 3.00 Page 11 of 14

October 15, 2015

Functional Description

The ISL9000A contains two high performance LDO’s. High

performance is achieved through a circuit that delivers fast

transient response to varying load conditions. In a quiescent

condition, the ISL9000A adjusts its biasing to achieve the lowest

standby current consumption.

The device also integrates current limit protection, smart thermal

shutdown protection, staged turn-on and soft-start. Smart

thermal shutdown protects the device against overheating.

Staged turn-on and soft-start minimize start-up input current

surges without causing excessive device turn-on time.

Power Control

The ISL9000A has two separate enable pins (EN1 and EN2) to

individually control power to each of the LDO outputs. When both

EN1 and EN2 are LOW, the device is in shutdown mode. During

this condition, all on-chip circuits are OFF, and the device draws

minimum current, typically less than 0.1µA.

When one or both of the enable pins are asserted, the device first

polls the output of the UVLO detector to ensure that VIN voltage is

at least about 2.1V. Once verified, the device initiates a start-up

sequence. During the start-up sequence, trim settings are first

read and latched. Then, sequentially, the bandgap, reference

voltage and current generation circuitry power-up. Once the

references are stable, a fast-start circuit quickly charges the

external reference bypass capacitor (connected to the CBYP pin)

to the proper operating voltage. After the bypass capacitor has

been charged, the LDOs power-up in their specified sequence.

Soft-start circuitry integrated into each LDO limits the initial

ramp-up rate to about 30µs/V to minimize current surge.

If EN1 is brought HIGH, and EN2 goes HIGH before the VO1

output stabilizes, the ISL9000A delays the VO2 turn-on until the

VO1 output reaches its target level.

If EN2 is brought high, and EN1 goes HIGH before VO2 starts its

output ramp, then VO1 turns on first and, the ISL9000A delays

the VO2 turn-on until the VO1 output reaches its target level.

If EN2 is brought HIGH, and EN1 goes HIGH after VO2 starts its

output ramp, then the ISL9000A immediately starts to ramp up

the VO1 output.

If both EN1 and EN2 are brought HIGH at the same time, the VO1

output has priority, and is always powered up first.

During operation, whenever the VIN voltage drops below about

1.8V, the ISL9000A immediately disables both LDO outputs.

When VIN rises back above 2.1V, the device re-initiates its

start-up sequence and LDO operation will resume automatically.

Reference Generation

The reference generation circuitry includes a trimmed bandgap,

a trimmed voltage reference divider, a trimmed current reference

generator, and an RC noise filter. The filter includes the external

capacitor connected to the CBYP pin. A 0.01µF capacitor

connected CBYP implements a 100Hz lowpass filter, and is

recommended for most high performance applications. For the

lowest noise application, a 0.1µF or greater CBYP capacitor

should be used. This filters the reference noise below the 10Hz to

1kHz frequency band, which is crucial in many noise-sensitive

applications.

The bandgap generates a zero temperature coefficient (TC)

voltage for the reference divider. The reference divider provides

the regulation reference, POR detection thresholds, and other

voltage references required for current generation and over-

temperature detection.

The current generator provides the references required for

adaptive biasing as well as references for LDO output current

limit and thermal shutdown determination.

LDO Regulation and Programmable Output

Divider

The LDO Regulator is implemented with a high-gain operational

amplifier driving a PMOS pass transistor. The design of the

ISL9000A provides a regulator that has low quiescent current,

fast transient response, and overall stability across all operating

and load current conditions. LDO stability is guaranteed for a 1µF

to 10µF output capacitor that has a tolerance better than 20%

and ESR less than 200m. The design is performance-optimized

for a 1F capacitor. Unless limited by the application, use of an

output capacitor value above 4.7µF is not normally needed as

LDO performance improvement is minimal.

Each LDO uses an independently trimmed 1V reference. An

internal resistor divider drops the LDO output voltage down to 1V.

This is compared to the 1V reference for regulation. The resistor

division ratio is programmed in the factory to one of the following

output voltages: 1.5V, 1.8V, 1.85V, 2.5V, 2.6V, 2.7V, 2.8V, 2.85V,

2.9V, 3.0V, and 3.3V.

Power-On Reset Generation

Each LDO has a separate Power-on Reset signal generation

circuit which outputs to the respective POR pins. The POR signal

is generated as follows:

A POR comparator continuously monitors the output of each LDO.

The LDO enters a power-good state when the output voltage is

above 94% of the expected output voltage for a period exceeding

the LDO PGOOD entry delay time. In the power-good state, the

open-drain PORx output is in a high-impedance state. An internal

100k pull-up resistor pulls the pin up to the respective LDO

output voltage. An external resistor can be added between the

PORx output and the LDO output for a faster rise time, however,

the PORx output should not connect through an external resistor to

a supply greater than the associated LDO voltage.

The power-good state is exited when the LDO output falls below

90% of the expected output voltage for a period longer than the

PGOOD exit delay time. While power-good is false, the ISL9000A

pulls the respective POR pin low.

For LDO-1, the PGOOD entry delay time is fixed at about 2ms

while the PGOOD exit delay is about 25µs. For LDO-2, the PGOOD

entry and exit delays are determined by the value of the external

capacitor connected to the CPOR pin. For a 0.01µF capacitor, the

entry and exit delays are 200ms and 25µs respectively. Larger or

smaller capacitor values will yield proportionately longer or

shorter delay times. The POR exit delay should never be allowed

to be less than 10µs to ensure sufficient immunity against

transient induced false POR triggering.

ISL9000A

FN6391 Rev 3.00 Page 12 of 14

October 15, 2015

Overheat Detection

The bandgap provides a proportional-to-temperature current that

is indicative of the temperature of the silicon. This current is

compared with references to determine if the device is in danger

of damage due to overheating. When the die temperature

reaches about +145°C, one or both of the LDO’s momentarily

shut down until the die cools sufficiently. In the overheat

condition, only the LDO sourcing more than 50mA will be shut

off. This does not affect the operation of the other LDO. If both

LDOs source more than 50mA and an overheat condition occurs,

both LDO outputs are disabled. Once the die temperature falls

back below about +110°C, the disabled LDO(s) are re-enabled

and soft-start automatically takes place.

The ISL9000A provides short-circuit protection by limiting the

output current to about 475mA. If short circuited, an output

current of 475mA will cause die heating. If the short circuit lasts

long enough, the overheat detection circuit will turn off the

output.

Revision History

The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you

have the latest revision.

DATE REVISION CHANGE

October 15, 2015 FN6391.3 Updated Ordering Information Table on page 1.

Updated “Evaluation Board Ordering Information” on page 5.

Updated POD from rev 3 to rev 4. Changes since rev 3:

Tiebar Note 4 updated

From: Tiebar shown (if present) is a non-functional feature.

To: Tiebar shown (if present) is a non-functional feature and may be located on any of the 4 sides (or ends).

March 26, 2014 FN6391.2 Added “Evaluation Board Ordering Information” on page 5.

Updated JA and JC in “Thermal Information” on page 6 from 50/10 to 52.8/11

Added standard "Boldface limits apply" verbiage to common conditions of “Electrical Specifications” table.

Bolded applicable specs.

Changed Note 8 in spec table from “Parts are 100% tested at +25°C. Temperature limits established by

characterization and are not production tested.” to “Parameters with MIN and/or MAX limits are 100% tested

at +25°C, unless otherwise specified. Temperature limits established by characterization and are not

production tested.”

Updated Products section on page 13 to new About Intersil verbiage.

Updated “Package Outline Drawing” on page 14. Changes:

Updated format to new standard

Removed package outline and included center to center distance between lands on recommended land pattern.

Removed Note 4 "Dimension b applies to the metallized terminal and is measured between 0.18mm and

0.30mm from the terminal tip." - it is not applicable to this package. Renumbered notes accordingly.

March 11, 2008 FN6391.1 Added “VO1, VO2 Pins” to “Absolute Maximum Ratings” on page 6.

Added “Other output voltage options may be available upon request" to page 1.

January 7, 2010 FN6391.0 Initial release.

FN6391 Rev 3.00 Page 13 of 14

October 15, 2015

ISL9000A

Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted

in the quality certifications found at www.intersil.com/en/support/qualandreliability.html

Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such

modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets are

current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its

subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Intersil or its subsidiaries.

For information regarding Intersil Corporation and its products, see www.intersil.com

For additional products, see www.intersil.com/en/products.html

All trademarks and registered trademarks are the property of their respective owners.

About Intersil

Intersil Corporation is a leading provider of innovative power management and precision analog solutions. The company's products

address some of the largest markets within the industrial and infrastructure, mobile computing and high-end consumer markets.

For the most updated datasheet, application notes, related documentation and related parts, please see the respective product

information page found at www.intersil.com.

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Reliability reports are also available from our website at www.intersil.com/support

ISL9000A

FN6391 Rev 3.00 Page 14 of 14

October 15, 2015

Package Outline Drawing

L10.3x3C

10 LEAD DUAL FLAT PACKAGE (DFN)

Rev 4, 3/15

located within the zone indicated. The pin #1 identifier may be

Unless otherwise specified, tolerance : Decimal ± 0.05

The configuration of the pin #1 identifier is optional, but must be

Dimensions in ( ) for Reference Only.

Dimensioning and tolerancing conform to AMSE Y14.5m-1994.

either a mold or mark feature.

Dimensions are in millimeters.1.

NOTES:

BOTTOM VIEW

DETAIL "X"

SIDE VIEW

TYPICAL RECOMMENDED LAND PATTERN

TOP VIEW

(4X) 0.10

INDEX AREA

PIN 1

PIN #1 INDEX AREA

SEATING PLANE

BASE PLANE

0.08

SEE DETAIL "X"

0.10 C

10 1

0.90

0.20

0.50

2.38

3.00

(10x 0.25)

(8x 0.50)

2.38

1.64

(10 x 0.60)

3.00

0.05

0.20 REF

10 x 0.25

10x 0.40

1.64

MAX

(4X) 0.10 CB

6. Compliant to JEDEC MO-229-WEED-3 except for E-PAD

dimensions.

2.80 TYP

Tiebar shown (if present) is a non-functional feature and may be

located on any of the 4 sides (or ends).