IR3870MPBF
PD-97392
SupIRBuck
Features
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TM
10A HIGHLY INTEGRATED
Description
The IR3870M
SupIRBuck
TM
is an easy-to-use,
fully integrated and highly efficient DC/DC
voltage regulator. The onboard constant on time
hysteretic controller and MOSFETs make IR3870
a space-efficient solution that delivers up to 10A
of precisely controlled output voltage in 60°C
ambient temperature applications without airflow.
Programmable switching frequency, soft start,
and over current protection allows for a very
flexible solution suitable for many different
applications. The combination of the gate drive
charge pump option and constant on time control
allow efficiency optimization in the whole output
current range, making this device an ideal choice
for battery powered applications.
Additional features include pre-bias startup, very
precise 0.5V reference, over/under voltage shut
down, power good output, and enable input with
voltage monitoring capability.
WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR
Input Voltage Range: 3V to 26V
Output Voltage Range: 0.5V to 12V
Continuous 10A Load Capability
Constant On-Time control
Excellent Efficiency at very low output current levels
Gate drive charge pump option to maximize
efficiency at higher output current levels
Compensation Loop not Required
Programmable switching frequency, soft start, and
over current protection
Power Good Output
Precision Voltage Reference (0.5V, +/-1%)
Enable Input with Voltage Monitoring Capability
Pre-bias Start Up
Under/Over Voltage Fault Protection
Ultra small, low profile 5 x 6mm QFN Package
Lead-free, halogen-free and RoHS compliant
Applications
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Notebook and desktop computers
Game consoles
Consumer electronics - STB, LCD TV, Printers
General purpose POL DC-DC Converters
Typical Notebook Application Circuit Diagram
6/2/2011
1
IR3870MPBF
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND unless otherwise specified)
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VIN ……………………………………………………. 30V
VCC ……………….….………………………………. 3.9V
PVCC ……………….….…………….……..………… 7.5V
Boot
……………………………………..……….….. 40V
PHASE …………………………………………..…….. -0.3V to 30V(DC), -5V(100ns)
Boot to PHASE…..…………………………….…..…… 7.5V
FF
………………………………………….………… 30V
PGND to GND ……………...…………………………. -0.3V to +0.3V
All other pins ……………...…………………………… 3.9V
Storage Temperature Range ..................................... -65°C To 150°C
Junction Temperature Range .................................... -10°C To 150°C
ESD Classification …………………………….……… JEDEC Class 1C
Moisture sensitivity level………………...…………….. JEDEC Level 3@260 °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 are not implied.
PACKAGE INFORMATION
5mm x 6mm POWER QFN
θ
JA
=
35
o
C / W
θ
J
-
PCB
=
2
o
C / W
ORDERING INFORMATION
PKG DESIG
M
M
PACKAGE
DESCRIPTION
IR3870MTRPbF
IR3870MTR1PbF
PIN COUNT
23
23
PARTS PER
REEL
4000
750
2
IR3870MPBF
Pin Description
NAME
NC
ISET
PGOOD
GND
FB
SS
NC
VCC
CPO
PVCC
PGND
PHASE
VIN
BOOT
FF
EN
NUMBER
1
2
3
4,17
5
6
7
8
9
10
11
12
13
14
15
16
3.3V
0.75V
5V
Reference
VIN
VIN
VIN
+PVCC
VIN
5V
5V
Reference
3.3V
3.3V
I/O LEVEL
DESCRIPTION
No connection
Connecting resistor to PHASE pin sets over current trip point
Power good – pull up to 5V
Bias return and signal reference
Inverting pin of PWM comparator and OVP/PGood sense
Set soft start slew-rate with a capacitor to GND
No connection
Internal bias supply
Charge pump output
Gate drive supply
Power return
Phase node (or switching node) of MOSFET half bridge
Input voltage for the system.
Bootstrapped gate drive supply – connect a capacitor to
PHASE
Input voltage feed forward – sets on-time with a resistor to
VIN
Enable – turns device on or off
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