Data Sheet No. PD60367
IR3710MTRPBF
WIDE INPUT AND OUTPUT, SYNCHRONOUS BUCK REGULATOR
FEATURES
Input Voltage Range: 3V to 28V
Output Voltage Range: 0.5V to 12V
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
16pin 3x3 MLPQ lead free package
RoHS compliant
DESCRIPTION
The IR3710 is a single-phase sync-buck PWM
controller optimized for efficiency in high performance
portable electronics. The switching modulator uses
constant on-time control. Constant on-time with diode
emulation provides the highest light-load efficiency
required for all.
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.
APPLICATION CIRCUIT
Enhanced Gate Drive Application Circuit:
V5
D2
D
BOOT
V
IN
R
FF
D1
V3.3
C1
CPO
PVCC
FF
BOOT
VCC
EN
FCCM
PGOOD
ISET
LGATE
PGND
FB
UGATE
L
C
BOOT
6.2k
10k
V
OUT
C
OUT
R
1
IR3710
PHASE
R
ISET
SS
GND
C
SS
R
2
ORDERING INFORMATION
Package Description
IR3710MTRPbF
Page 1 of 20
Pin Count
16
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IR Confidential
Parts Per Reel
4000
4/26/10
IR3710MTRPBF
Fix Gate Voltage Application Circuit:
V5
D
BOOT
V
IN
V3.3
NC
R
FF
CPO
PVCC
FF
BOOT
VCC
EN
FCCM
PGOOD
ISET
LGATE
PGND
FB
UGATE
L
C
BOOT
6.2k
10k
V
OUT
C
OUT
R
1
IR3710
PHASE
R
ISET
SS
GND
C
SS
R
2
3.3V Input Voltage Application Circuit:
V3.3
D
BOOT
NC
6.2k
10k
VCC
EN
FCCM
PGOOD
ISET
LGATE
PGND
FB
R
FF
CPO
PVCC
FF
BOOT
UGATE
L
C
BOOT
V
OUT
C
OUT
IR3710
PHASE
R
1
R
2
R
ISET
SS
GND
C
SS
Page 2 of 20
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4/26/10
IR3710MTRPBF
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings (Referenced to GND)
BOOT Voltage: ................................................40 V
PHASE Voltage:....-5V(100ns),-0.3V(DC) to 32.5 V
FF, ISET:..........................................................32 V
BOOT minus PHASE Voltage:........................7.5 V
PVCC: ............................................................7.5 V
VCC:................................................................3.9 V
PGOOD:..........................................................3.9 V
PGND to GND:................................... -0.3V to 0.3V
All other pins ...................................................3.9 V
Operating Junction Temperature .. -10°C to +150
o
C
Storage Temperature Range .......... -65
o
C to 150
o
C
ESD Rating ...............................................Class 1C
MSL Rating ..................................................Level 2
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.
RECOMMENDED OPERATING CONDITIONS
Symbol
V
IN
BOOT to PHASE
V
OUT
Fs
Definition
Input Voltage
Supply Voltage
Output Voltage
Switching Frequency
0.5
Min
3
Max
28*
7.0
12
1000
Units
V
V
V
kHz
*
Note: PHASE pin must not exceed 32.5V.
ELECTRICAL SPECIFICATIONS
PARAMETER
BIAS SUPPLIES
VCC Turn-on Threshold
VCC Turn-off Threshold
VCC Threshold Hysterisis
PVCC Turn-on Threshold
PVCC Turn-off Threshold
PVCC Threshold Hysterisis
VCC Shutdown Current
VCC Operating Current
PVCC Shutdown Current
FF Shutdown Current
CONTROL LOOP
Reference Accuracy, V
REF
On-Time Accuracy
Zero Current Threshold
Soft-Start Current
NOTE
Unless otherwise specified, these specifications apply: VCC = 3.3V, PVCC = 7.0V, 0
o
C
≤
T
J
≤
125
o
C
TEST CONDITION
MIN
TYP
MAX
3
2.65
60
3.05
2.65
EN=LOW
EN=HIGH, No gate loading
EN=LOW; PVCC = 5V
EN=LOW
V
FB
= 0.5V
R
FF
= 180K, V
IN
= 12.6V
Measure at V
PHASE
FCCM = EN = HIGH
0.495
270
-4.5
8
60
25
1.2
20
2
0.5
300
10
0.505
330
4.5
12
UNIT
V
V
mV
V
V
mV
μA
mA
μA
μA
V
ns
mV
μA
Page 3 of 20
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4/26/10
IR3710MTRPBF
PARAMETER
FAULT PROTECTION
ISET pin output current
Under Voltage Threshold
Under Voltage Hysteresis
Over Voltage Threshold
PGOOD Delay Threshold (V
SS
)
GATE DRIVE
UGATE Source Resistance
UGATE Sink Resistance
UGATE Rise and Fall Time
LGATE Source Resistance
LGATE Sink Resistance
LGATE Rise Time
LGATE Fall Time
Dead time
NOTE
TEST CONDITION
MIN
18
0.37
TYP
20
0.4
7.5
0.6
0.6
1.5
1
10
1.5
0.4
15
10
5
400
3.3
1
7.2
5
2.1
MAX
22
0.43
UNIT
μA
V
mV
V
V
Ω
Ω
ns
Ω
Ω
ns
ns
ns
ns
Ω
Ω
V
Falling V
FB
& monitor PGOOD
Rising V
FB
Rising V
FB
& monitor PGOOD
1
1
1
1
I
GATE
= 0.1A
I
GATE
= 0.1A
3nF load; 1V & 4V thresholds
I
GATE
= 0.1A
I
GATE
= 0.1A
6.8nF load; 1V to 4V
6.8nF load; 4V to 1V
Measure time from
V
LGATE
= 1V to V
UGATE
= 1V
3
2
3
1
50
Minimum LGATE Interval
CHARGE PUMP OUTPUT
Source Resistance
I
CPO
=15mA
Sink Resistance
I
CPO
=15mA
Charge Pump Disable
FCCM = HIGH
Threshold, V
CP TH
LOGIC INPUT AND OUTPUT
EN Rising Threshold
EN Hysterisis
EN Input Current
FCCM Rising Threshold
FCCM Falling Threshold
FCCM Hysterisis
FCCM Input Current
PGOOD pull down resistance
I
PGOOD
=2mA
NOTES:
1.
Guaranteed by design, not tested in production
6.8
1.14
40
1.22
100
1
0.7
0.3
50
1.3
160
1
1.2
0.5
V
mV
μA
V
V
μA
Ω
1
100
Page 4 of 20
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IR Confidential
4/26/10
IR3710MTRPBF
IC PIN ORDER AND DESCRIPTION
NAME
BOOT
FF
EN
ISET
PGOOD
GND
FCCM
FB
SS
VCC
CPO
PVCC
LGATE
PGND
PHASE
UGATE
NUMBER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
I/O LEVEL
V
IN
+PVCC
V
IN
3.3V
32V
3.3V
DESCRIPTION
Bootstrapped gate drive supply – connect a capacitor to PHASE
Input voltage feed forward – sets on-time with a resistor to V
IN
Enable input; EN = LOW inhibits GATE pulses
Current limit setting with a resistor to PH pin
Power good – pull up to 3.3V
Bias return and signal reference
Force continuous conduction mode when pulled up to VCC
Feedback input
Set soft start slew-rate with a capacitor to GND
IC bias supply
Charge Pump Output
Gate drive supply
Lower gate drive for synchronous MOSFET
Power return – connect to source of synchronous MOSFET
Phase node (or switching node) of MOSFET half bridge
Upper gate drive for control MOSFET
Reference
3.3V
3.3V
3.3V
3.3V
3.3V
7.4V
PVCC
Reference
V
IN
V
IN
+ V5
UGATE
PHASE
16
15
14
13
LGATE
12
11
PGND
BOOT
FF
EN
ISET
1
2
PVCC
CPO
VCC
SS
GND
3
4
10
9
5
6
7
PGOOD
GND FCCM FB
θ
JA
= 49
o
C/W
θ
JC
= 4
o
C/W
Page 5 of 20
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8
4/26/10
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