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Linear Technology Electronic Components Datasheet

LTC3721EUF-1 Datasheet

Push-Pull PWM Controller

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LTC3721-1
Push-Pull PWM Controller
FEATURES
High Efficiency Push-Pull PWM
1.5A Sink, 1A Source Output Drivers
Adjustable Push-Pull Dead-Time
Adjustable System Undervoltage Lockout and
Hysteresis
Adjustable Leading Edge Blanking
Low Start-Up and Quiescent Currents
Current Mode Operation
Single Resistor Slope Compensation
VCC UVLO and 25mA Shunt Regulator
Programmable Fixed Frequency Operation to 1MHz
Soft-Start, Cycle-by-Cycle Current Limiting and
Hiccup Mode Short-Circuit Protection
5V, 15mA Low Dropout Regulator
16-Pin SSOP and (4mm × 4mm) QFN Packages
U
APPLICATIO S
Telecommunications, Infrastructure Power Systems
Distributed Power Architectures
Server Power Supplies
High Density Power Modules
DESCRIPTIO
The LTC®3721-1 push-pull PWM controller provides all of
the control and protection functions necessary for com-
pact and highly efficient, isolated power converters. High
integration minimizes external component count, while
preserving design flexibility.
The robust push-pull output stages switch at half the
oscillator frequency. Dead-time is independently pro-
grammed with an external resistor. A UVLO program input
provides precise system turn-on and turn off voltages. The
LTC3721-1 features peak current mode control with pro-
grammable slope compensation and leading edge
blanking.
The LTC3721-1 features extremely low operating and
start-up currents and reliable short-circuit and
overtemperature protection. The LTC3721-1 is offered in
16-pin SSOP and (4mm × 4mm) QFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
VIN
Isolated Push-Pull Converter
FROM
AUXILIARY
WINDING
VREF
UVLO
DRVA
DRVB
VCC
CS
DPRG
LTC3721-1
CT
RLEB
VREF
SS
COMP
FB GND
RCS
VOUT
VOUT
V+
COLL
COMP
LT1431
RTOP
RREF
RMID
GND-F GND-S
VOUT
+
37211 TA01
sn37211 37211fs
1


Linear Technology Electronic Components Datasheet

LTC3721EUF-1 Datasheet

Push-Pull PWM Controller

No Preview Available !

LTC3721-1
ABSOLUTE AXI U RATI GS (Note 1)
VCC to GND (Low Impedance Source) .......– 0.3V to 10V
(Chip Self-Regulates at 10.3V)
UVLO to GND ............................................. – 0.3V to VCC
All Other Pins to GND
(Low Impedance Source) .........................– 0.3V to 5.5V
VCC (Current Fed) ................................................. 40mA
VREF Output Current ............................... Self-Regulated
Operating Temperature (Notes 5,6)
LTC3721-1 ......................................... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (GN Package only)
(Soldering, 10sec) ............................................ 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VREF 1
NC 2
NC 3
DRVB 4
VCC 5
DRVA 6
GND 7
CT 8
16 NC
15 UVLO
14 SS
13 FB
12 RLEB
11 COMP
10 CS
9 DPRG
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 100°C/W
ORDER PART
NUMBER
LTC3721EGN-1
GN PART
MARKING
37211
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
16 15 14 13
DRVB 1
12 FB
VCC 2
DRVA 3
17
11 RLEB
10 COMP
PGND 4
9 CS
5678
UF PACKAGE
16-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 100°C/W
EXPOSED PAD IS GND
(PIN17) MUST BE SOLDERED TO PCB
ORDER PART
NUMBER
LTC3721EUF-1
UF PART
MARKING
37211
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 9.5V unless otherwise noted.
SYMBOL PARAMETER
Input Supply
VCCUV
VCCHY
ICCST
ICCRN
VSHUNT
RSHUNT
SUVLO
VCC Undervoltage Lockout
VCC UVLO Hysteresis
Start-Up Current
Operating Current
Shunt Regulator Voltage
Shunt Resistance
System UVLO Threshold
SHYST
System UVLO Hysteresis Current
CONDITIONS
MIN TYP MAX UNITS
Measured on VCC
Measured on VCC
VCC = VUVLO – 0.3V
No Load on Outputs
10.25 10.7
V
3.8
4.2
V
145 230
µA
3
6
mA
Current into VCC = 10mA
Current into VCC = 10mA to 17mA
Measured on UVLO Pin, 10mA into VCC
Current Flows Out of UVLO Pin, 10mA into VCC
10.3 10.8
V
1.4
3.5
4.8
5.0
5.2
V
8.5
10
11.5
µA
2
sn37211 37211fs


Part Number LTC3721EUF-1
Description Push-Pull PWM Controller
Maker Linear
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LTC3721EUF-1 Datasheet PDF






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