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JANTX1N647-1

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3721-1
1
sn37211 37211fs
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
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.
■
Telecommunications, Infrastructure Power Systems
■
Distributed Power Architectures
■
Server Power Supplies
■
High Density Power Modules
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
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
■
V
CC
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
Push-Pull PWM Controller
R
CS
V
OUT
V
OUT
V
+
V
OUT
R
TOP
GND-F
LT1431
GND-S
COLL R
REF
COMP R
MID
37211 TA01
V
IN
FROM
AUXILIARY
WINDING
V
REF
+
DRVA
DRVB
CSV
CC
DPRG
LTC3721-1
V
REF
COMP
UVLO
C
T
R
LEB
SS
FB GND
Isolated Push-Pull Converter
LTC3721-1
2
sn37211 37211fs
V
CC
to GND (Low Impedance Source) .......–0.3V to 10V
(Chip Self-Regulates at 10.3V)
UVLO to GND............................................. –0.3V to V
CC
All Other Pins to GND
(Low Impedance Source) .........................–0.3V to 5.5V
V
CC
(Current Fed) ................................................. 40mA
ORDER PART
NUMBER
GN PART
MARKING
T
JMAX
= 125°C, θ
JA
= 100°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
37211
LTC3721EGN-1
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 9.5V unless otherwise noted.
V
REF
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
ORDER PART
NUMBER
UF PART
MARKING
37211
LTC3721EUF-1
T
JMAX
= 125°C, θ
JA
= 100°C/W
EXPOSED PAD IS GND
(PIN17) MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
TOP VIEW
GN PACKAGE
16-LEAD PLASTIC SSOP
16
15
14
13
12
11
10
9
V
REF
NC
NC
DRVB
V
CC
DRVA
GND
C
T
NC
UVLO
SS
FB
R
LEB
COMP
CS
DPRG
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Supply
V
CCUV
V
CC
Undervoltage Lockout Measured on V
CC
10.25 10.7 V
V
CCHY
V
CC
UVLO Hysteresis Measured on V
CC
3.8 4.2 V
I
CCST
Start-Up Current V
CC
= V
UVLO
– 0.3V ● 145 230 µA
I
CCRN
Operating Current No Load on Outputs 3 6 mA
V
SHUNT
Shunt Regulator Voltage Current into V
CC
= 10mA 10.3 10.8 V
R
SHUNT
Shunt Resistance Current into V
CC
= 10mA to 17mA 1.4 3.5 Ω
SUVLO System UVLO Threshold Measured on UVLO Pin, 10mA into V
CC
4.8 5.0 5.2 V
SHYST System UVLO Hysteresis Current Current Flows Out of UVLO Pin, 10mA into V
CC
8.5 10 11.5 µA
16
17
15 14 13
5 6 7 8
TOP VIEW
UF PACKAGE
16-LEAD (4mm × 4mm) PLASTIC QFN
9
10
11
12
4
3
2
1DRVB
V
CC
DRVA
PGND
FB
R
LEB
COMP
CS
NC
V
REF
UVLO
SS
SGND
C
T
NC
DPRG
LTC3721-1
3
sn37211 37211fs
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 9.5V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Pulse Width Modulator
ROS Ramp Offset Voltage Measured on COMP, CS = 0V 0.65 V
I
RMP
Ramp Discharge Current CS = 1V, COMP = 0V, C
T
= 4V 50 mA
I
SLP
Slope Compensation Current Measured on CS, C
T
= 1V 30 µA
C
T
= 2.25V 68 µA
DCMAX Maximum Duty Cycle COMP = 4.5V ● 47 48.2 50 %
DCMIN Minimum Duty Cycle COMP = 0V ● 0%
DTADJ Dead-Time 130 ns
Oscillator
OSCI Initial Accuracy T
A
= 25°C, C
T
= 270pF 220 250 280 kHz
OSCT V
CC
Variation V
CC
= 6.5V to 9.5V ● –3 3 %
OSCV C
T
Ramp Amplitude Measured on C
T
2.35 V
Error Amplifier
V
FB
FB Input Voltage COMP = 2.5V, (Note 3) 1.172 1.2 1.22 V
FB
I
FB Input Range Measured on FB, (Note 4) –0.3 2.5 V
AVOL Open-Loop Gain COMP = 1V to 3V, (Note 3) 70 90 dB
I
IB
Input Bias Current COMP = 2.5V, (Note 3) 5 50 nA
V
OH
Output High Load on COMP = –100µA 4.7 4.92 V
V
OL
Output Low Load on COMP = 100µA 0.27 0.5 V
I
SOURCE
Output Source Current COMP = 2.5V 400 700 µA
I
SINK
Output Sink Current COMP = 2.5V 2 5 mA
Reference
V
REF
Initial Accuracy T
A
= 25°C, Measured on V
REF
4.925 5.00 5.075 V
REFLD Load Regulation Load on V
REF
= 100µA to 5mA 2 15 mV
REFLN Line Regulation V
CC
= 6.5V to 9.5V 1 10 mV
REFTV Total Variation Line, Load and Temperature ● 4.900 5.000 5.100 V
REFSC Short-Circuit Current V
REF
Shorted to GND 18 30 45 mA
Push-Pull Outputs
DRVH(x) Output High Voltage I
OUT(x)
= –100mA 9.2 V
DRVL(x) Output Low Voltage I
OUT(x)
= 100mA 0.17 V
RDH(x) Pull-Up Resistance I
OUT(x)
= –10mA to –100mA 2.9 Ω
RDL(x) Pull-Down Resistance I
OUT(x)
= –10mA to –100mA 1.7 Ω
TDR(x) Rise-Time C
OUT(x)
= 1nF 10 ns
TDF(x) Fall-Time C
OUT(x)
= 1nF 10 ns
Current Limit and Shutdown
CLPP Pulse by Pulse Current Limit Threshold Measured on CS 280 300 320 mV
CLSD Shutdown Current Limit Threshold Measured on CS 475 600 725 mV
CLDEL Current Limit Delay to Output 100mV Overdrive on CS, (Note 2) 80 ns
SSI Soft-Start Current SS = 2.5V 10 13 16 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

JANTX1N647-1

Mfr. #:
Buy JANTX1N647-1
Manufacturer:
Microchip / Microsemi
Description:
Rectifiers Switching Diode
Lifecycle:
New from this manufacturer.
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