Vishay Siliconix
Si9145
Document Number: 70021
S-40710-Rev. K, 19-Apr-04
www.vishay.com
1
Product is End of Life 3/2014
Low-Voltage Switchmode Controller
FEATURES
• 2.7 V to 7 V Input Operating Range
• Voltage-Mode PWM Control
• High-Speed, Source-Sink Output Drive (200 mA)
• Internal Oscillator (up to 2 MHz)
• Standby Mode
• 0 - 100 % Controllable Maximum Duty-Cycle 2.7 V to 7 V
Input Operating Range
• 0 - 100 % Controllable Maximum Duty-Cycle
DESCRIPTION
The Si9145 switchmode controller IC is ideally suited for high
efficiency dc/dc converters in low input voltage systems. Oper-
ation is guaranteed down to 2.7 V, with a minimum start-up volt-
age of 3.0 V making the Si9145 ideal for use with NiCd, NMH,
and lithium ion battery packs. A mode select pin allows the out-
put driver polarity to be programmed allowing the device to
function as a step-up or step-down converter.
Features include a precision bandgap reference, a wide band-
width error amplifier, a 2 MHz oscillator, an input voltage moni-
tor with standby mode and a 200 mA output driver.
Supply current in normal operation is typically 1.1 mA and
250 µA in standby mode.
The Si9145 implements conventional voltage mode control.
The maximum duty cycle in boost mode can be limited by volt-
age on DMAX/SS pin. Frequency can be externally pro-
grammed by selection of ROSC and COSC.
The Si9145 is available in both standard and lead (Pb)-free 16-
pin SOIC and TSSOP packages and is specified over the
industrial temperature range (- 25 °C to 85 °C).
FUNCTIONAL BLOCK DIAGRAM
PentiumTM is a trademark of Intel Corporation. PowerPCTM is a trademark of IBM.
-
+
UVLO
SET
D
MAX
/SS
COMP
C
OSC
FB
NI
V
S
OUTPUT
P
GND
GND
V
UVLO
Oscillator
OTS
Temp
Sense
V
REF
1.5 V Reference
Generator
R
OSC
ENABLE
MODE SELECT
V
DD
UVLO
Error Amp
S
R
Logic
Control
-
+
-
+
Driver
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Document Number: 70021
S-40710-Rev. K, 19-Apr-04
Vishay Siliconix
Si9145
Product is End of Life 3/2014
Notes:
a. Device Mounted with all leads soldered or welded to PC board.
b. Derate 7.2 mW/°C above 25 °C.
c. Derate 7.4 mW/°C above 25 °C.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation
of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
ABSOLUTE MAXIMUM RATINGS
Parameter Limit Unit
Voltages Referenced to GND
VDD, VS8
V
PGND ± 0.3
VDD to VS- 0.3
Linear Inputs - 0.3 V to VDD to + 0.3
Logic Inputs - 0.3 V to VDD to + 0.3
Continuous Output Current 100 mA
Storage Temperature - 65 to 125 °C
Operating Junction Temperature 150
Power Dissipation (Package)a16-Pin SOIC (Y Suffix)b900 mW
16-Pin TSSOP (Q Suffix)c925
Thermal Impedance (ΘJA)16-Pin SOIC 140 °C/W
16-Pin TSSOP 135
RECOMMENDED OPERATING RANGE
Parameter Limit Unit
Voltages Referenced to GND
VDD 2.7 V to 7 V V
VS2.7 V to 7 V
fOSC 2 kHz to 2 MHz
ROSC 5 kΩ to 250 kΩkΩ
COSC 47 pF to 200 pF pF
Linear Inputs 0 to VDD
Digital Inputs 0 to VDD
VREF Load Resistance > 150 kΩ
SPECIFICATIONS
Parameter Symbol
Test Conditions
Unless Otherwise Specifieda
2.7 V ≤ VDD ≤ 7 V, VDD = VS
GND = PGND
Limits
B Suffix - 25 to 85 °C Unit
MinbTyp Maxb
Reference
Output Voltage VREF
IREF = - 10 µA 1.455 1.545 V
TA = 25 °C 1.477 1.50 1.523
Oscillator
Maximum FrequencycfMAX VCC = 3.0 V, COSC = 47 pF, ROSC = 5.0 kΩ2.0
MHz
Accuracy fOSC VCC = 3.0 V
COSC = 100 pF, ROSC = 6.98 kΩ TA = 25 °C 0.85 1.0 1.15
ROSC Voltage VROSC 1.0
V
Minimum Start-Up Voltage VDDOSC 3.0
50 % DMAX/SS VDMAX 50 % MODE SELECT = VDD
1.30
100 % DMAX/SS VDMAX 100 % 1.58
DMAX/SS Input Current IDMAX DMAX = 0 to VDD - 100 100 nA
Voltage StabilitycΔf/f
2.7 V ≤ VDD ≤ 7 V, Ref to 4.8 V
TA = 25 °C
- 16 16
%
2.7 V ≤ VDD ≤ 4.2 V, Ref to 3.5 V - 8 8
3.8 V ≤ VDD ≤ 5.6 V, Ref to 4.7 V - 7 7
Temperature StabilitycReferenced to 25 °C ± 5
Document Number: 70021
S-40710-Rev. K, 19-Apr-04
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3
Vishay Siliconix
Si9145
Product is End of Life 3/2014
Notes:
a. CSTRAY < 5 pF on COSC. After Start-Up, VDD of ≥ 3 V.
b. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet.
c. Guaranteed by design, not subject to production testing.
SPECIFICATIONS
Parameter Symbol
Test Conditions
Unless Otherwise Specifieda
2.7 V ≤ VDD ≤ 7 V, VDD = VS
GND = PGND
Limits
B Suffix - 25 to 85 °C
Unit
MinbTyp Maxb
Error Amplifier (COSC = GND, OSC DISABLED)
Input BIAS Current IFB VNI = VREF
, VFB = 1.0 V - 1.0 1.0 µA
Open Loop Voltage Gain AVOL 47 55 dB
Offset Voltage VOS VNI = VREF - 15 0 15 mV
Unity Gain BandwidthcBW 10 MHz
Output Current IEA
Source (VFB = 1 V, NI = VREF)- 2.0 - 1.0 mA
Sink (VFB = 2 V, NI = VREF)0.4 0.8
Power Supply RejectioncPSRR 2.7 V < VDD < 7.0 V 60 dB
UVLOSET Voltage Monitor
Under Voltage Lockout VUVLOHL UVLOSET High to Low 0.85 1.0 1.15 V
VUVLOLH UVLOSET Low to High 1.2
Hysteresis VHYS VUVLOLH - VUVLOHL 200 mV
UVLO Input Current IUVLO VUVLO = 0 to VDD - 100 100 nA
Output
Output High Voltage VOH VDD = 2.7 V, IOUT = - 10 mA 2.55 2.60 V
Output Low Voltage VOL VDD = 2.7 V, IOUT = 10 mA 0.06 0.15
Peak Output Current ISOURCE VDD = 2.7 V, VOUT = 0 V - 180 - 130 mA
Peak Output Current ISINK VDD = 2.7 V, VOUT = 2.7 V 150 200
Logic
ENABLE Delay to Output tdEN ENABLE Rising to OUTPUT 1.5 νs
ENABLE Logic Low VENL 0.2 VDD V
ENABLE Logic High VENH 0.8 VDD
ENABLE Input Current IEN ENABLE = 0 to VDD - 1.0 1.0 µA
MODE SELECT Logic Low VMODEL 0.2 VDD V
MODE SELECT Logic High VMODEH 0.8 VDD
MODE SELECT Input Current IMODE MODE SELECT = 0 to VDD - 1.0 1.0 µA
Over Temperature Sense
Trip Point TTRIP 150 °C
Output Low Voltage VOTSL VDD = 2.7 V, IOUT = 1 µA 0.06 0.15 V
Output High Voltage VOTSH VDD = 2.7 V, IOUT = - 1 µA 2.55 2.6
Supply
Supply Current - Normal Mode IDD
VDD = 2.7 V, fOSC = 1 MHz, ROSC = 6.98 kΩ1.1 1.5 mA
VDD = 7 V, fOSC = 1 MHz, ROSC = 6.98 kΩ1.6 2.3
Supply Current - Standby Mode ENABLE = Low 250 330 µA
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Document Number: 70021
S-40710-Rev. K, 19-Apr-04
Vishay Siliconix
Si9145
Product is End of Life 3/2014
TYPICAL CHARACTERISTICS
VREF vs. Supply Voltage
VREF vs. Load Current
Supply Current
vs. Supply Voltage and Output Load
1.485
1.490
1.495
1.500
1.505
1.510
1.515
2345678
VDD - Supply Voltage (V)
)V(
FER
V
VREF with 10 µ A Load
1.485
1.490
1.495
1.500
1.505
1.510
1.515
0 5 10 15 20 25 30
2.7, 3.0, 3.6 V
VREF - Sourcing Current (µA)
)V
(
FER
V
5.0 V
7.0 V
0
5
10
15
20
25
234567
)Am( tnerruC ylppuS
VDD - Supply Voltage (V)
CL = 2,200 pF
900 pF
100 pF
10 pF
f = 1 MHz
VREF vs. Temperature
Error Amplifier Gain and Phase
Supply Current
vs. Switching Frequency and Output Load
1.485
1.490
1.495
1.500
1.505
1.510
1.515
- 25 0 25 50 75 100 125
)V(
FER
V
t - Temperature (°C)
VDD = 3.6 V
)
g
e
d
(
es
a
h
P
)Bd( niaG
f - Frequency (MHz)
80
0
- 30
- 60
- 90
- 120
- 150
60
40
20
0
- 20
- 40
0.0001 0.001 0.01 0.1 1 10 100
Gain
Phase
0
5
10
15
20
25
0.5 1.0 1.5 2.0
)
Am(
t
ner
r
uC
y
lp
pu
S
Switching Frequency (MHz)
CL = 2,200 pF
900 pF
100 pF
10 pF
VDD = 3.6 V
Document Number: 70021
S-40710-Rev. K, 19-Apr-04
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5
Vishay Siliconix
Si9145
Product is End of Life 3/2014
TYPICAL CHARACTERISTICS
Supply Current
vs. Frequency and Supply Voltage
Standby Current
vs. Supply Voltage and Temperature
Switching Frequency vs. Supply Voltage
1
2
3
4
5
0.0 0.2 0.4 0.6 0.8 1.0
f - Frequency (MHz)
)Am( tnerruC ylppuS
CL = 10 pF
2.7 V
3.0 V
3.6 V
5.0 V
VDD = 7.0 V
220
230
240
250
260
270
234567
(µA)
t
n
e
r
ru
C
ybdnatS
VDD - Supply Voltage (V)
TA = 85 °C
25 °C
- 25 °C
0.90
0.95
1.00
1.05
1.10
1.15
1.20
234567
)zH
M(
ycneuqe
rF gn
ih
c
tiw
S
VDD - Supply Voltage (V)
ROSC = 6.98 kΩ
COSC = 100 pF
Supply Current
vs. Supply Voltage and Temperature
Duty Cycle vs. DMAX/SS Voltage
Frequency vs. ROSC/COSC
0.9
1.1
1.3
1.5
1.7
1.9
2.5 3.5 4.5 5.5 6.5 7.5
TA = 85 °C
25 °C
)Am( tnerruC lamroN
VDD - Supply Voltage (V)
CL = 10 pF
f = 1 MHz
-25 °C
0
20
40
60
80
100
1.0 1.1 1.2 1.3 1.4 1.5 1.6
)%
(
e
lcyC ytu
D
DMAX/SS (V)
0.01
0.10
1.00
10.00
COSC - Capacitance (pF)
)zHM
(
y
c
neuqe
rF
gn
ihc
tiw
S
4.99 kΩ
12.1 kΩ
24.9 kΩ
49.9 kΩ
100 kΩ
249 kΩ
40 300100 200
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Document Number: 70021
S-40710-Rev. K, 19-Apr-04
Vishay Siliconix
Si9145
Product is End of Life 3/2014
TYPICAL CHARACTERISTICS
Output Rise Time
vs. Supply Voltage and Load
Enable Delay to Output
VREF vs. Bypass Capacitor
0
10
20
30
40
50
234567
)Sn( emiT esiR tuptuO
VDD - Supply Voltage (V)
CL = 2,200 pF
900 pF
100 pF
10 pF
10
20
30
40
50
234567
VDD - Supply Voltage (V)
)Sn( yale
D
tuptuO
Mode Select = High
Mode Select = Low
1.485
1.490
1.495
1.500
1.505
1.510
1.515
0246810
VDD = 3.6 V
)V(
FER
V
Capacitance (mF)
Output Fall Time
vs. Supply Voltage and Load
UVLO Hysteresis vs. Supply Voltage
0
10
20
30
40
50
234567
VDD - Supply Voltage (V)
)Sn( emiT llaF
900 pF
100 pF 10 pF
CL = 2,200 pF
150
170
190
210
230
250
234567
VDD - Supply Voltage (V)
)Vm( s
is
eretsyH
O
LV
U
Document Number: 70021
S-40710-Rev. K, 19-Apr-04
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7
Vishay Siliconix
Si9145
Product is End of Life 3/2014
TIMING WAVEFORMS
Figure 1. Si9145 Timing Diagram (MODE SELECT = High)
ENABLE
MODE SELECT
UVLO
SET
R
OSC
C
OSC
OUTPUT
D
MAX
/SS
1.2 V
1.0 V
ON
OFF
> 1.5 V Set for 50 % Max.
1.0 V
Start-Up (UVLO) Normal (Duty Cycle Limit) Standby
Figure 2. Si9145 Timing Diagram (MODE SELECT = Low)
ENABLE
MODE SELECT
UVLOSET
ROSC
COSC
OUTPUT
DMAX/SS
1.2 V
1.0 V
OFF
ON
Start-Up (UVLO) Normal (Duty Cycle Limit) Standby
1.0 V
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Document Number: 70021
S-40710-Rev. K, 19-Apr-04
Vishay Siliconix
Si9145
Product is End of Life 3/2014
PIN CONFIGURATIONS
PIN DESCRIPTION
Pin 1: VDD
The positive power supply for all functional blocks except
output driver. A bypass capacitor of 0.1 µF (minimum) is rec-
ommended.
Pin 2: MODE SELECT
This pin is used to enable maximum duty cycle limit and set
output polarity of controller. When connected to VDD, the
maximum duty cycle function is controlled by the DMAX/SS
pin. The maximum duty cycle limit is usually used for forward,
flyback, and boost converters. The output polarity is high
when the PWM circuitry requires the external device to be
turned on.
When connected to GND, the maximum duty cycle is not lim-
ited (usually for buck converters driving a P-Channel MOS).
The output polarity is low when the PWM circuitry requires
the external PMOS to be turned on.
Pin 3: DMAX/SS
DMAX/SS pin controls the maximum duty cycle achievable by
the PWM circuitry when the MODE SELECT = VDD.
When DMAX/SS is at less than 1.0 V (typical) the OUTPUT is
held low (0 % duty cycle). When DMAX/SS is at more than
1.5 V (typical), the PWM circuitry can achieve 100 % duty
cycle. With voltage at DMAX/SS between 1.0 V and 1.5 V, the
maximum duty cycle is proportionally limited to this voltage.
The addition of external components can implement a soft
start function.
Pin 4: COMP
This pin is the output of the error amplifier. A compensation
network is connected from this pin to the FB pin to stabilize
the system. This pin drives one input of the internal pulse
width modulation comparator.
Pin 5: FB
The inverting input of the error amplifier. External resistors
are connected to this pin to set the regulated output voltage.
The compensation network is also connected to this pin.
Pin 6: NI
The non-inverting input of the error amplifier. In normal oper-
ation it is externally connected to the VREF pin.
Pin 7: VREF
This pin supplies 1.5 V trimmed to ± 1.5 %. The reference
voltage is generated by a band-gap reference.
Pin 8: GND
Negative return for VDD.
ORDERING INFORMATION - SOIC-16
Part Number Temperature Range
Si9145BY-T1 - 25° to 85 °C
Si9145BY-T1-E3
13
VDD VS
MODE SELECT OUTPUT
DMAX/SS PGND
COMP UVLOSET
FB
NI
VREF
ENABLE
OTS
COSC
GND ROSC
SOIC-16
14
15
16
2
3
4
1
10
11
125
6
7
9
8
Top View
ORDERING INFORMATION - TSSOP-16
Part Number Temperature Range
Si9145BQ-T1 - 25° to 85 °C
Si9145BQ-T1-E3
13
VDD VS
MODE SELECT OUTPUT
DMAX/SS PGND
COMP UVLOSET
FB
NI
VREF
ENABLE
OTS
COSC
GND ROSC
TSSOP-16
14
15
16
2
3
4
1
10
11
125
6
7
9
8
Top View
Document Number: 70021
S-40710-Rev. K, 19-Apr-04
www.vishay.com
9
Vishay Siliconix
Si9145
Product is End of Life 3/2014
Pin 9: ROSC
This pin is the equivalent of a 1.0 V voltage source derived
from the on-chip VREF. When a low T.C. resistor is externally
connected from this pin to GND, a temperature independent
current is generated internally. This current is used as the
charging current source connected to the COSC pin. The cur-
rent is internally multiplied by 2 and is used as the discharg-
ing current source connected to the COSC pin. Therefore, the
external resistor is one of the factors that determine the oscil-
lator frequency.
Pin 10: COSC
An external capacitor is connected to this pin to set the oscil-
lator frequency. Internal current sources alternately charge
and discharge the external capacitor. The oscillator wave-
form is a symmetrical triangular type with a typical voltage
swing between 1.0 V and 1.5 V.
Pin 11: OTS
This pin indicates an over-temperature condition on the
device when the output is low. The output is latched low and
is reset with the ENABLE pin going low then high, or by turn-
ing power off and on.
Pin 12: ENABLE
A logic high on this pin allows normal operation. A logic low
places the chip in the standby mode. In standby mode nor-
mal operation is disabled, supply current is reduced, the
oscillator stops and the output is held high for MODE
SELECT = low, and low for MODE SELECT = high.
Pin 13: UVLOSET
This pin will place the chip in the standby mode if the
UVLOSET voltage drops below 1.2 V. Once the UVLOSET
voltage exceeds 1.2 V, the chip operates normally. There is
a built-in hysteresis of 200 mV.
Pin 14: PGND
The negative return for the VS supply.
Pin 15: OUTPUT
This CMOS push-pull output pin drives the external MOS-
FET and is capable of sinking 150 mA or sourcing 130 mA
with VS equal to 2.7 V.
Pin 16: VS
The positive terminal of the power supply which powers the
CMOS output driver. A bypass capacitor is required.
fOSC
0.7
ROSC COSC
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10
Document Number: 70021
S-40710-Rev. K, 19-Apr-04
Vishay Siliconix
Si9145
Product is End of Life 3/2014
APPLICATIONS
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Tech-
nology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability
data, see http://www.vishay.com/ppg?70021.
Figure 3. Non-Isolated Step Up Boost Converter for VOUT > VIN
Si9145
2.7 V - 7 V
V
DD
C1
Q1
C2
L1 D1
V
OUT
0 V
Figure 4. Non-Isolated Step Down Buck Converter for VOUT < VIN
Si9145
2.7 V - 7 V
C1
Q1
C2
L1
D1
0 V
VDD
VOUT
Figure 5. Non-Isolated Synchronous Buck Converter for VOUT < VIN
Si9145
2.7 V - 7 V
C1
Q1
C2
L1
Q2
0 V
V
DD
V
OUT
All Leads
0.101 mm
0.004 IN
E
H
C
D
e B A1 LĬ
4312 8756
131416 15 91012 11
Package Information
Vishay Siliconix
Document Number: 72807
28-Jan-04
www.vishay.com
1
SOIC (NARROW): 16-LEAD (POWER IC ONLY)
JEDEC Part Number: MS-012
MILLIMETERS INCHES
Dim Min Max Min Max
A1.35 1.75 0.053 0.069
A10.10 0.20 0.004 0.008
B0.38 0.51 0.015 0.020
C0.18 0.23 0.007 0.009
D9.80 10.00 0.385 0.393
E3.80 4.00 0.149 0.157
e1.27 BSC 0.050 BSC
H5.80 6.20 0.228 0.244
L0.50 0.93 0.020 0.037
Ĭ0_8_0_8_
ECN: S-40080—Rev. A, 02-Feb-04
DWG: 5912
Vishay Siliconix
Package Information
Document Number: 74417
23-Oct-06
www.vishay.com
1
Symbols
DIMENSIONS IN MILLIMETERS
Min Nom Max
A - 1.10 1.20
A1 0.05 0.10 0.15
A2 - 1.00 1.05
B 0.22 0.28 0.38
C - 0.127 -
D 4.90 5.00 5.10
E 6.10 6.40 6.70
E1 4.30 4.40 4.50
e-0.65-
L 0.50 0.60 0.70
L1 0.90 1.00 1.10
y--0.10
θ10°3°6°
ECN: S-61920-Rev. D, 23-Oct-06
DWG: 5624
TSSOP: 16-LEAD
PAD Pattern
www.vishay.com Vishay Siliconix
Revision: 02-Sep-11 1Document Number: 63550
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
RECOMMENDED MINIMUM PAD FOR TSSOP-16
0.281
(7.15)
Recommended Minimum Pads
Dimensions in inches (mm)
0.171
(4.35)
0.055
(1.40)
0.012
(0.30)
0.026
(0.65)
0.014
(0.35)
0.193
(4.90)
Legal Disclaimer Notice
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Revision: 02-Oct-12 1Document Number: 91000
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