© Semiconductor Components Industries, LLC, 2006
April, 2006 − Rev. 11 1Publication Order Number:
NCP5201/D
NCP5201
Dual Output
DDR Power Controller
The NCP5201 Dual DDR Power Controller is specifically
designed as a total power solution for a high current DDR memory
system. This IC combines the efficiency of a PWM controller for the
VDDQ supply with the simplicity of a linear regulator for the VTT
memory termination voltage. The secondary regulator (VTT) is
designed to automatically track at half the primary regulator voltage
(VDDQ). An internal power good voltage monitor tracks both
VDDQ and VTT outputs and notifies the user in the event of a fault
on either output. Protective features include soft−start circuitry and
undervoltage monitoring of VCC and VSTBY. The IC is packaged in
a 5 × 6 QFN−18.
Features
Incorporates VDDQ, VTT Regulators
Internal Switching Standby Regulator for VDDQ
All External Power MOSFETs Are N−Channel
Adjustable VDDQ
VTT Tracks VDDQ/2
Fixed Switching Frequency of 250 kHz for VDDQ in Normal Mode
Doubled Switching Frequency (500 kHz) for Standby Mode
Soft−Start Protection for VDDQ
Undervoltage Monitor
Short−Circuit Protection for Both VDDQ and VTT Outputs
Housed in a space saving 5 × 6 QFN−18
Pb−Free Packages are Available*
Typical Applications
DDR Termination Voltage
Active Termination Busses (SSTL−2, SSTL−3)
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques Reference
Manual, SOLDERRM/D.
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Device Package Shipping
ORDERING INFORMATION
NCP5201MN 18−Lead QFN 61 Units / Rail
MARKING
DIAGRAM
PIN CONNECTIONS
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = W ork Week
G= Pb−Free Package
18−LEAD QFN, 5 x 6 mm
MN SUFFIX
CASE 505
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
FBDDQ
FBVTT
PGND
VSTBY
VTT
VTT
OCDDQ
VDDQ
NC
SS
COMP
VCC
TGDDQ
BGDDQ
SDDQ
AGND
S3_EN
PWRGD
NCP5201MNR2 18−Lead QFN 2500/Tape & Re
el
1
For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
s
Brochure, BRD8011/D.
NOTE: Pin 1 9 i s t h e thermal pad on the bottom of
the device.
NCP5201
AWLYYWW G
G
1
NCP5201MNR2G 18−Lead QFN
(Pb−Free) 2500/Tape & Re
el
NCP5201MNG 61 Units / Rail18−Lead QFN
(Pb−Free)
(Note: Microdot may be in either location)
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2
5 VSTBY
VSTBY
PWRGD
SDDQ
BGDDQ
S3_EN
VDDQ
FBDDQ
4
11
8
1
17
18
12
7
C4
1.0 F
COMP
SS
C12
10 nF
C13
22 nF
5 V
AGND
OCDDQ
VTT
FBVTT
PGND
VTT
AGND
R10
1.1 k
C11
 nF R12
20 k
C17
0.1 FRL1
62 k
C10
100 nF
R6
16
R7
1.15 k
R2
10 k R3
10 k
S3 16
C5
1.0 F
VCC
10
15
13
14
5
6
2
3
12 V
TGDDQ
C2
1.0 F
C1
1000 F
L1 1.0
H
R8 4.7
R1 4.7
R5 4.7 L2 2.2 H
++
AGND
C14
1000
F
C15
470
F
C15
1.0
F
VTT
VDD
Q
+
COUT
(1000Fx3
)
NTD60N02R
NTD60N02R
NTD60N02R
S
D
D
S
Figure 1. Application Diagram
MAXIMUM RATINGS
Rating Symbol Value Unit
Power Supply Voltage (Pin 4) to PGND (Pin 3) and GND (Pin 12) VSTBY −0.3, 6.0 V
Power Supply Voltage, VCC (Pin 16) to PGND (Pin 3) and GND (Pin 12) VCC −0.3, 14 V
Gate Drive Voltage (Pins 14, 15) Vg −0.3 DC,
−4.0 for < 1.0 s; 14 V
Input/Output Pins (Pins 1, 2, 5−11, 13, 17−18) VIO −0.3, 6.0 V
Package Thermal Resistance, Junction−to−Ambient RJA 35 °C/W
Operating Junction Temperature Range TJ0 to +150 °C
Operating Ambient Temperature Range TA0 to +70 °C
Storage Temperature Range Tstg −55 to +150 °C
Moisture Sensitivity Level MSL 2
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may af fect
device reliability.
1. This device series contains ESD protection and exceeds the following tests:
Human Body Model (HBM) 2.0 kV per JEDEC Standard JESD22−A114 except Pin 15 which is 1.5 kV.
Machine Model (MM) 200 V per JEDEC Standard JESD22−A115 except Pin 14 which is 100 V.
2. Latchup Current Maximum Rating: 150 mA per JEDEC Standard JESD78.
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3
ELECTRICAL CHARACTERISTICS (VSTBY = 5.0 V, VCC = 12 V, TA = 0 to 70°C, L2 = 1.7 H, COUT = 3770 F, COUT2 = 220 F,
RL1 = 100 k, R7 = 1.0 k, R10 = 1.0 k, R12 = 20 k, R6 = 16 , C12 = 3.0 nF, C11 = 6.0 nF, C10 = 80 nF, for min/max values unless
otherwise noted)
Characteristic Symbol Test Conditions Min Typ Max Unit
SUPPLY CURRENT
S0 Mode Supply Current from VSTBY IST_S0 S3_EN = LOW, VCC = 12 V 8.0 mA
S3 Mode Supply Current from VSTBY IST_S3 S3_EN = HIGH, VCC = 0 V 4.0 mA
S0 Mode Supply Current from VCC ICC_S0 EN = HIGH, VCC = 12 V,
2.0 nF Capacitive Load to TGDDQ
and BGDDQ
30 mA
UNDERVOLT AGE MONITOR
VSTBY UVLO Lower Threshold VSBUV− 4.25 V
Ratio of VSTBY UVLO Upper to
Lower Threshold VSBUV+/
VSBUV− 1.05
VCC UV Monitor Lower Threshold VCCUV− 9.23 V
Ratio of VCC UV Monitor Upper to
Lower Threshold VCCUV+/
VCCUV− 1.14
VDDQ SWITCHING REGULATOR
FBDDQ Feedback Voltage,
Control Loop in Regulation VFBQ TA = 25°C
TA = 0 to 70°C1.271
1.264 1.300
1.326
1.333 V
V
Feedback Input Current Ifb V(FBDDQ) = 1.3 V 0.5 A
Oscillator Frequency in S0 Mode F 225 250 275 kHz
OCDDQ Pin Current Sink IOC V(OCDDQ) = 4.0 V 6.0 10 14 A
Minimum Duty Cycle Dmin 0 %
Maximum Duty Cycle Dmax 100 %
Soft−Start Timing tss1 CSS = 33 nF 10 16 ms
VDDQ STANDBY REGULATOR
FBDDQ Feedback Voltage, Control
Loop in Regulation VFBQ TA = 25°C
TA = 0 to 70°C1.281
1.274 1.300
1.319
1.326 V
V
Load Regulation LOADreg ILOAD from 50 mA to 650 mA 0.4 %
Peak Current Limit ILIMstbpk 2.0 A
Peak Current Limit Blanking Time tbk 400 ns
Oscillator Frequency in S3 Mode Fstb 500 kHz
VDDQ ERROR AMPLIFIER
DC Gain GAIN 70 dB
Unity Gain Bandwidth Ft COMP_GND = 200 nF, 1.0 in
series (Test circuit only) 2.0 MHz
Slew Rate SR COMP_GND = 10 pF 8.0 V/s
VTT ACTIVE TERMINATOR
VTT Tracking VDDQ/2 at S0 Mode dVTT0 VDDQ/2 − VTT,
IOUT = 1.8 A (Sink Current)
IOUT = −1.8 A (Source Current) −30
30 mV
mV
Source Current Limit ILIMVTsrc −2.3 A
Sink Current Limit ILIMVTsnk 2.3 A
3. Guaranteed by design, not tested in production.
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4
ELECTRICAL CHARACTERISTICS (VSTBY = 5.0 V, VCC = 12 V, TA = 0 to 70°C, L2 = 1.7 H, COUT = 3770 F, COUT2 = 220 F,
RL1 = 100 k, R7 = 1.0 k, R10 = 1.0 k, R12 = 20 k, R6 = 16 , C12 = 3.0 nF, C11 = 6.0 nF, C10 = 80 nF, for min/max values unless
otherwise noted)
Characteristic UnitMaxTypMinTest ConditionsSymbol
CONTROL SECTION
S3_EN Pin Threshold HIGH S3_EN_H 1.4 V
S3_EN Pin Threshold LOW S3_EN_L 0.5 V
S3_EN Pin Input Current IIN_EN 0.5 A
PWRGD Pin ON Resistance PWRGD_R 80
PWRGD Pin OFF Current PWRGD_
LEAK 1.0 A
PWRGD LOW−to−HIGH Hold Time,
For S3 to S0 or S5 to S0 thold 200 s
GATE DRIVERS
TGDDQ Gate Pull−HIGH Resistance VCC = 12 V,
V(TGDDQ) = 11
V
RH_TG 3.0
TGDDQ Gate Pull−LOW Resistance VCC = 12 V,
V(TGDDQ) = 1.0
V
RL_TG 2.5
BGDDQ Gate Pull−HIGH Resistance VCC = 12 V,
V(BGDDQ) = 11
V
RH_BG 3.0
BGDDQ Gate Pull−LOW Resistance VCC = 12 V,
V(BGDDQ) = 1.0
V
RL_BG 1.3
PIN DESCRIPTION
Pin No. Symbol Description
ÑÑÑÑ
ÑÑÑÑ
1
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
FBDDQ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
VDDQ feedback pin for closed loop regulation.
ÑÑÑÑ
ÑÑÑÑ
2
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
FBVTT
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
VTT regulator sense voltage.
ÑÑÑÑ
ÑÑÑÑ
3
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
PGND
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Power ground.
ÑÑÑÑ
ÑÑÑÑ
4
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
VSTBY
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
5 V Standby input voltage.
ÑÑÑÑ
ÑÑÑÑ
5, 6
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
VTT
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
VTT regulator output.
ÑÑÑÑ
ÑÑÑÑ
7
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
OCDDQ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Overcurrent sense and program input for the VDDQ high−side FET.
ÑÑÑÑ
ÑÑÑÑ
8
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
VDDQ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Reference input and power stage input for VTT regulator.
ÑÑÑÑ
ÑÑÑÑ
9
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
NC
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Not connected.
ÑÑÑÑ
ÑÑÑÑ
10
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
PWRGD
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Open drain status output. High impedance when the product is operating in S0 state and both
DDQ and VTT regulators are in compliance.
ÑÑÑÑ
ÑÑÑÑ
11
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
S3_EN
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
S3 mode enable input. High to enable.
ÑÑÑÑ
ÑÑÑÑ
12
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
AGND
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Analog ground connection and remote ground sense.
ÑÑÑÑ
ÑÑÑÑ
13
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
SDDQ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Inductor driven node and current limit sense input.
ÑÑÑÑ
ÑÑÑÑ
14
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
BGDDQ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Gate driver output, VDDQ Low−Side N−Channel Power FET. Active during S0 mode.
ÑÑÑÑ
ÑÑÑÑ
15
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
TGDDQ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Gate driver output, VDDQ High−Side N−Channel Power FET. Active during S0 mode.
ÑÑÑÑ
ÑÑÑÑ
16
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
VCC
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
12 Volt input supply. This voltage is monitored by power good circuitry for mode selection.
ÑÑÑÑ
ÑÑÑÑ
17
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
COMP
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
VDDQ error amplifier compensation node.
ÑÑÑÑ
ÑÑÑÑ
18
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
SS
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Soft−start capacitor connection to ground.
ÑÑÑÑ
Ñ
ÑÑÑ
ÑÑÑÑ
19
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑ
Ñ
ÑÑÑÑÑÑÑ
TH_PAD
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Ñ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Ñ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Copper pad on bottom of IC used for heatsinking. This pin should be connected to the ground
plane under the IC.
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5
+
S3_EN
VCC
PWRGD
OCDDQ
TGDDQ
BGDDQ
SDDQ
VDDQ
COMP
FBDDQ
Thermal
Shutdown
VREF
Control
Logic
12 V
VREF
12 V−
UVLO
+
VSTBY
VSTBY
VREF
5 VST−
UVLO VSTGD
PGND
VDDQ
PWM
Logic
INREGVTT INREGDDQ
S3
S0
OSC S3
S0
+ −
PWM−
COMP +
+
R
R
R
R
GND
VTT
Regulation
Control
S3
S0
INREGDDQ
INREGVTT
S3
S0
SC2PWR
SC2GND
A
PGND
VSTBY
PGND
VSTBY
PGND
+
ILIM
PGND
12 V
IREF
VSTBY
Voltage and
Current Reference
12 VGD
VREFGD
AMP VREF
PGND
VSTBY
PGND
12 V
TSD
VTT
FBVTT
SS
AGND PGND
+
Figure 2. Internal Block Diagram
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6
DETAILED OPERATION DESCRIPTIONS
General
The NCP5201 Dual DDR Power Controller combines
the efficiency of a PWM controller for the VDDQ supply
with the simplicity of a linear regulator for the VTT
memory termination voltage. VTT is designed to
automatically track at half VDDQ.
The inclusion of an internal PWM switching FET for
VDDQ standby operation, both VDDQ and VTT power
good voltage monitors, soft−start, undervoltage detection,
and thermal shutdown, make this device a total power
solution for high current DDR memory systems. The IC is
packaged in 5 × 6 QFN−18.
IC Control States
The state decode logic and internal control functions are
powered by 5.0 V VSTBY. An internal voltage reference
and bias current block is enabled when VSTBY exceeds
3.8 V. Once VREF reaches its regulation voltage, internal
signal _VREFGD will be asserted HIGH. This transition
wakes up the voltage monitor block, which in turn detects
whether the VSTBY and VCC voltages are within certain
preset regulation levels. If they are, the voltage monitor
generates an internal HIGH VSTGD and 12 VGD
respectively.
There is an internal detection for 100% duty cycle of
TGDDQ switching, if it occurs, an internal signal
MAXDTY is asserted HIGH.
The logic control block accepts an external signal at the
S3_EN pin and internal voltage monitor signals MXDTY,
12 VGD and VSTGD to decode the operating states in
accordance with Table 1. PWRGD is an open−drain logic
output that signifies VDDQ and VTT are both in regulation
in the S0 mode.
Table 1. Control Logic State T ruth Table
Input Conditions Operation Mode
VSTGD S3_EN 12 VGD MAXDTY Prev. Next
Low X X X X S5
High Low Low X X S5
High Low High X X S0
High High High Low S0 S0
High High X High S0 S3
High High Low X S0 S3
High High X X S3 S3
VDDQ Regulator in Normal (SO) mode
The VDDQ regulator in S0 mode is a switching
synchronous rectification buck controller directly driving
two external N−Channel power FETs. An external resistor
divider sets the nominal output voltage. The control
architecture is voltage mode fixed frequency PWM with
external compensation, and with switching frequency
fixed at 250 kHz ±10%. As can be observed from Figure 1,
the VDDQ output voltage is divided down and fed back to
pin FBDDQ. This voltage connects to the inverting input
of the internal error amplifier while the amplifiers
noninverting input is connected to an internal voltage
reference, VREF (= 1.3 V). The amplifier compares the
feedback voltage to VREF and outputs an error signal to the
PWM comparator. This error signal is compared with a
fixed frequency RAMP waveform derived from the
internal oscillator to generate a pulse−width−modulated
signal. This PWM signal drives the external N−Channel
Power FETs via the TGDDQ and BGDDQ pins. External
inductor L and COUT1 filter the output waveform, which
is subsequently fed back to FBDDQ via a resistor voltage
divider to close the loop at VDDQ = VFBQ (1 + R2/R1).
An adjustable soft−start is implemented, activated each
time the IC exits state S5. When in normal mode, and
regulation of VDDQ is detected, signal INREGDDQ will
go HIGH to notify the Control Logic block.
Tolerance of VDDQ
The tolerance of VFBQ and the ratio of external resistor
divider R7/R10 both impact the precision of VDDQ. With
the control loop in regulation, VDDQ = (VFBQ)
(1 + R7/R10). With a worst case (for all valid operating
conditions) VFBQ tolerance of ±2%, a worst case range of
±2.5% for VDDQ will be assured if the ratio R7/R10 is
specified as 0.9230 ±1%.
Synchronous Rectification
For enhanced efficiency, an active synchronous switch is
used to eliminate the conduction loss contributed by the
forward voltage of a diode or Schottky diode rectifier.
Adaptive nonoverlap timing control of the complementary
gate drive output signals is provided to reduce large
shoot−through currents, which degrade efficiency.
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7
VDDQ Regulator in Standby Mode (S3)
An internal P−Channel power FET switching at 500 kHz
(doubled frequency), with peak current limit preset at
2.0 A, provides nonsynchronous switch−mode control
while in the S3 state. In this mode, the internal P−Channel
power FET derives its source from the 5 VSTBY pin. The
2.0 A peak current limit is designed to yield an average
output current limit of 700 mA when using a 1.7 H output
inductor. When using this value inductor, the regulator will
operate in discontinuous conduction mode (DCM) in the S3
state. And, switching in doubled frequency (500 kHz) is to
reduce the peak conduction current. In this operating mode,
the body diode of the external synchronous MOSFET acts
as a flywheel diode and the MOSFET is never turned on.
TGDDQ and BGDDQ are set Low to disable the external
switches. Nominal output voltage and the PWM control
scheme of Normal mode still apply.
Table 2. States, Operation and Output Pin Conditions
Operation Mode
Operating Conditions Output Pin Conditions
VDDQ VTT TGDDQ BGDDQ PWRGD
S0 Normal Normal Normal Normal H−Z
S3 Standby H−Z Low Low Low
S5 H−Z H−Z Low Low Low
Fault Protection of VDDQ Regulator
During state S0, external resistor (RL1) sets current limit
for the high−side switch. An internal 10 A current sink at
pin OCDDQ establishes the voltage drop across this
resistor, which is compared to the voltage at the SDDQ pin
when the high−side drive is high, and after a fixed period
(500 ns) of blanking time to avoid false current limit
triggering. When the voltage at SDDQ is lower than that at
OCDDQ, an overcurrent condition occurs, both FETs are
latched−off until the IC goes into S5 then S0, VDDQ will
soft−start again. This protects against a short−to−ground
condition on SDDQ or VDDQ.
During state S3, the internal P−Channel power FET is
activated and switching. If the conduction current of the
FET is higher than 2.0 A after a fixed period (X500 ns) of
blanking time, an overcurrent condition occurs, and the
FET is turned off for the remainder of that switching cycle.
Feedback Compensation of VDDQ Regulator
The compensation network is shown in Figure 1.
VTT Active Terminator in Normal Mode (S0)
The VTT regulator is a two−quadrant linear regulator
with internal N−channel power FETs to provide transient
current sink and source capability up to 1.8 A. This output
is activated in normal mode in state S0 when VDDQ is in
regulation. It is in standby mode in state S3. When in
normal mode and VTT is in regulation, signal INREGVTT
will go HIGH to notify the control logic block. The input
power path is from VDDQ. Gate drive power is derived
from VSTBY. VTT is stable with any value of output
capacitor greater than 220 F, and is insensitive to ESR
value ranging 2 m to 400 m.
VTT Active Terminator in Standby Mode (S3)
VTT output is high−impedance in S3 mode.
Fault Protection of VTT Active Terminator
To provide protection for the internal FETs, bidirectional
current limit is implemented, preset at 2.3 A magnitude.
Thermal Consideration of VTT Active Terminator
The VTT terminator is designed to handle large transient
output currents. If large currents are required for very long
durations, then care should be taken to ensure the
maximum junction temperature is not exceeded. The 5 × 6
QFN−18 has a thermal resistance 35°C/W (dependent on
air flow, grade of copper and number of VIAs).
Undervoltage Monitor
The IC monitors VSTBY and VCC. If VSTBY is higher
than its preset threshold (derived from VREF, with
hysteresis), _VSTGD is set HIGH. Operation is identical
for VCC and _12 VGD. The CONTROL LOGIC accepts
both _VSTGD and _12 VGD to determine the state of the
IC.
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8
VSTBY
S3_EN
VCC
VDDQ
VTT
PWRGD
Operating
Mode
Soft−Start
tss1
thold 200 s
VTT in H−Z
thold 200 s
S0 S3 S0 S5
VSTGD goes HIGH
12 VGD goes HIGH,
VDDQ is activated
INREGDDQ goes HIGH,
VTT is activated
INREGVTT goes HIGH S3_EN goes HIGH,
VTT goes into standby
mode, then INREGVTT
goes LOW, PWRGD
goes LOW, then or VCC
or 5 VCC goes LOW
triggering VDDQ going
into standby mode.
INREGVTT
goes HIGH VCC goes LOW;
VDDQ is disabled, then
INREGDDQ goes LOW,
PWRGD goes LOW
S3_EN goes LOW,
VDDQ is in normal
mode, INREGDDQ
goes HIGH, then VTT
goes into normal mode
S5
Figure 3. Power−Up and Power−Down Timing Diagram
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9
PACKAGE DIMENSIONS
DFN−18
CASE 505−01
ISSUE B
C0.15
E2
D2
L
b18X
A
DNOTES:
1. DIMENSIONS AND TOLERANCING PER
ASME Y14.5M, 1994.
2. DIMENSIONS IN MILLIMETERS.
3. DIMENSION b APPLIES TO PLATED
TERMINAL AND IS MEASURED BETWEEN
0.25 AND 0.30 MM FROM TERMINAL
4. COPLANARITY APPLIES TO THE EXPOSED
PAD AS WELL AS THE TERMINALS.
E
C
e
AB
DIM MIN MAX
MILLIMETERS
A0.80 1.00
A1 0.00 0.05
A3 0.20 REF
b0.18 0.30
D6.00 BSC
D2 3.98 4.28
E5.00 BSC
E2 2.98 3.28
e0.50 BSC
K0.20 −−−
L0.45 0.65
C0.15
PIN 1 LOCATION
A1
(A3)
SEATING
PLANE
C0.08
C0.10
18X
K18X
A0.10 BC
0.05 C NOTE 3
19
1018
2X
2X
18X
SIDE VIEW
T OP VIEW
BOTTOM VIEW
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