APU3137 Datasheet PDF - Advanced Power Electronics

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APU3137
Advanced Power Electronics

Part Number APU3137
Description 8-PIN SYNCHRONOUS PWM CONTROLLER
Page 17 Pages


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Technology Licensed from International Rectifier
APU3137
8-PIN SYNCHRONOUS PWM CONTROLLER
FEATURES
1A Peak Output Drive Capability
0.8V Reference Voltage
Shuts off both drivers at shorted output
and shutdown
Operating with single 5V or 12V supply voltage
Stable with ceramic capacitors
Internal 200KHz Oscillator
Soft-Start Function
Protects the output when control FET is shorted
Synchronous Controller in 8-Pin Package
RoHS Complaint
APPLICATIONS
DDR Memory Application
Low voltage distributed DC-DC
Graphic Cards
Low cost on-board DC to DC such as 5V to 2.5V,
1.8V or 0.8V
DESCRIPTION
The APU3137 controller IC is designed to provide a low
cost and high performance synchronous Buck regulator
for on-board DC to DC converter applications. The out-
put voltage can be set as low as 0.8V and higher voltage
can be obtained with an external voltage divider. High
peak current gate drivers provide fast switching transi-
tion for applications requiring high output current in the
range of 15A to 20A.
This device features an internal 200KHz oscillator, un-
der-voltage lockout for both Vcc and Vc supplies, an
external programmable soft-start function as well as
output under-voltage detection that latches off the de-
vice when an output short is detected.
TYPICAL APPLICATION
C3
1uF
12V
C4
1uF
C2
4x 150uF
Optional
L1
1uH
C1
47uF
5V
Vcc Vc
HDrv
SS/SD
C8 U1
0.1uF APU3137 LDrv
C9
3300pF
Optional
Comp
R4 Gnd
30K
Fb
Q1
IRF7832
D1
Q2
IRF7832
L2
2.2uH
R5
1K, 1%
R3
2.15K
2.5V
@ 15A
C7
3x 330uF
40m, Poscap
Figure 1 - Typical application of APU3137.
PACKAGE ORDER INFORMATION
TA (°C)
0 To 70
DEVICE
APU3137M
PACKAGE
8-Pin Plastic SOIC NB (M)
FREQUENCY
200KHz
Data and specifications subject to change without notice.
200510061-1/17
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APU3137
ABSOLUTE MAXIMUM RATINGS
Vcc Supply Voltage .................................................. -0.5V - 25V
Vc Supply Voltage .................................................... -0.5V - 25V
Storage Temperature Range ...................................... -65°C To 150°C
Operating Junction Temperature Range ..................... 0°C To 125°C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device.
PACKAGE INFORMATION
8-PIN PLASTIC SOIC NB (M)
Fb 1
Vcc 2
LDrv 3
Gnd 4
8 SS
7 Comp
6 Vc
5 HDrv
θJA=160°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Vcc=5V, Vc=12V and TA=0 to 70°C. Typical values refer
to TA=25 C.
PARAMETER
SYM
TEST CONDITION
Reference Voltage
Fb Voltage
VFB
Fb Voltage Line Regulation
LREG 5<Vcc<12
UVLO
UVLO Threshold - Vcc
UVLO Vcc Supply Ramping Up
UVLO Hysteresis - Vcc
UVLO Threshold - Vc
UVLO Vc Supply Ramping Up
UVLO Hysteresis - Vc
UVLO Threshold - Fb
UVLO Fb Fb Ramping Down
UVLO Hysteresis - Fb
Supply Current
Vcc Dynamic Supply Current Dyn Icc Freq=200KHz, CL=3000pF
Vc Dynamic Supply Current Dyn Ic Freq=200KHz, CL=3000pF
Vcc Static Supply Current
ICCQ SS=0V
Vc Static Supply Current
ICQ SS=0V
Soft-Start Section
Charge Current
SSIB SS=0V
MIN
0.784
4.0
3.0
0.3
15
TYP
0.800
4.25
0.25
3.5
0.25
0.4
0.25
6.5
11
4
2.5
22
MAX UNITS
0.816
1.6
V
mV
4.5 V
V
3.65 V
V
0.5 V
V
8 mA
14 mA
6 mA
4 mA
30 µA
2/17
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APU3137
PARAMETER
Error Amp
Fb Voltage Input Bias Current
Fb Voltage Input Bias Current
Transconductance
Oscillator
Frequency
Ramp-Amplitude Voltage
Output Drivers
Rise Time
Fall Time
Dead Band Time
Max Duty Cycle
Min Duty Cycle
SYM
TEST CONDITION
IFB1 SS=3V, Fb=1V
IFB2 SS=0V, Fb=1V
GM
Freq
VRAMP Note 1
Tr CL=3000pF (10% to 90%)
Tf CL=3000pF (90% to 10%)
TDB
TON Fb=0.7V, Freq=200KHz
TOFF Fb=1.5V
Note 1: Guaranteed by design but not tested in production.
MIN TYP MAX UNITS
0.1 µA
50 µA
600 850 1100 µmho
180 240 KHz
1.25 V
35 70 ns
35 70 ns
100 ns
85 90
%
0%
PIN DESCRIPTIONS
PIN#
1
PIN SYMBOL PIN DESCRIPTION
Fb This pin is connected directly to the output of the switching regulator via resistor divider to
provide feedback to the Error amplifier.
2 Vcc This pin provides biasing for the internal blocks of the IC as well as power for the low side
driver. A minimum of 1µF, high frequency capacitor must be connected from this pin to
ground to provide peak drive current capability.
3 LDrv Output driver for the synchronous power MOSFET.
4 Gnd This pin serves as the ground pin and must be connected directly to the ground plane. A
high frequency capacitor (0.1 to 1µF) must be connected from VCC and Vc pins to this
pin for noise free operation.
5
HDrv
Output driver for the high side power MOSFET. This pin should not go negative (below
ground), this may cause problem for the gate drive circuit. It can happen when the inductor
current goes negative (Source/Sink), soft-start at no load and for the fast load transient
from full load to no load. To prevent negative voltage at gate drive, a low forward voltage
drop diode might be connected between this pin and ground.
6 Vc This pin is connected to a voltage that must be at least 4V higher than the bus voltage of
the switcher (assuming 5V threshold MOSFET) and powers the high side output driver. A
minimum of 1µF, high frequency capacitor must be connected from this pin to ground to
provide peak drive current capability.
7
Comp
Compensation pin of the error amplifier. An external resistor and capacitor network is
typically connected from this pin to ground to provide loop compensation.
8 SS / SD This pin provides soft-start for the switching regulator. An internal current source charges
an external capacitor that is connected from this pin to ground which ramps up the output
of the switching regulator, preventing it from overshooting as well as limiting the input
current. The converter can be shutdown by pulling this pin below 2.8V.
3/17
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APU3137
BLOCK DIAGRAM
Vcc 2
3V
20uA
SS/SD 8
POR
0.8V
Fb 1
Comp 7
25K
25K
Bias
Generator
3V
0.8V
4.25V
POR
Vc
3.5V
64uA Max
Oscillator
Ct
Error Amp
Error Comp
FbLo Comp
0.4V
S
Q
R
Reset Dom
2.8V
POR
SS
Figure 2 - Simplified block diagram of the APU3137.
6 Vc
5 HDrv
Vcc
3 LDrv
4 Gnd
4/17
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