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Linear Technology Electronic Components Datasheet

LTC3901 Datasheet

Secondary Side Synchronous Driver for Push-Pull and Full-Bridge Converters

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LTC3901
Secondary Side
Synchronous Driver for Push-Pull
and Full-Bridge Converters
FEATURES
N-Channel Synchronous MOSFET Driver
Programmable Timeout
Reverse Inductor Current Sense
Gate Drive Transformer Synchronization
Sequence Monitor
Wide VCC Supply Range: 4.5V to 11V
15ns Rise/Fall Times at VCC = 5V, CL = 4700pF
Undervoltage Lockout
Small 16-Lead SSOP Package
U
APPLICATIO S
48V Input Isolated DC/DC Converters
Isolated Telecom Power Supplies
Distributed Power Step-Down Converters
Industrial Control System Power Supplies
Automotive and Heavy Equipment
DESCRIPTIO
The LTC®3901 is a secondary side synchronous rectifier
driver designed to be used in isolated push-pull and full-
bridge converter power supplies. The chip drives two
external N-channel MOSFETs and accepts a transformer-
generated bipolar input to maintain sychronization with
the primary side controller.
The LTC3901 provides a full range of protection features
for the external MOSFETs. A programmable timeout func-
tion is included that disables both drivers when the syn-
chronization signal is missing or incorrect. Additionally,
the chip senses the output inductor current through the
drain-source resistance of the two MOSFETs, turning off
the MOSFETs if the inductor current reverses. The LTC3901
also shuts off the drivers if the supply is low or if the
synchronization sequence is incorrect.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
VIN
36V TO 72V
ISOLATION
BARRIER
T1
MA MB
ME
DRVA
DRVB
LTC3723
PUSH-PULL
CONTROLLER
COMP VFB SDRA SDRB
MF
T2
L1
CSE+
ME
CSE–
VCC
GND
LTC3901
CSF+
PVCC
MF
CSF–
PGND
SYNC TIMER
OUT FB
LT4430 OR LT1431
OPTOCOUPLER
DRIVER
COMP
Figure 1. Simplified Isolated Push-Pull Converter
+
COUT
VOUT
12V
3901 F01
3901f
1


Linear Technology Electronic Components Datasheet

LTC3901 Datasheet

Secondary Side Synchronous Driver for Push-Pull and Full-Bridge Converters

No Preview Available !

LTC3901
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage
VCC, PVCC ............................................................................ 12V
Input Voltage
CSE, CSF, TIMER ................. –0.3V to (VCC + 0.3V)
SYNC ...................................................... –12V to 12V
Input Current
CSE+, CSF+ ..................................................................... 15mA
Operating Temperature Range (Note 2) ...–40°C to 85°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
PVCC 1
ME 2
ME 3
PGND 4
CSE5
CSE+ 6
TIMER 7
GND 8
16 VCC
15 MF
14 MF
13 PGND
12 CSF
11 CSF+
10 GND
9 SYNC
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
TJMAX = 125°C, θJA = 130°C/W
ORDER PART
NUMBER
LTC3901EGN
GN PART
MARKING
3901
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating
temperature range. VCC = 5V, TA = 25°C unless otherwise specified. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
VCC
VUVLO
IVCC
Timer
Supply Voltage Range
4.5 5 11
VCC Undervoltage Lockout Threshold
VCC Undervoltage Lockout Hysteresis
VCC Supply Current
Rising Edge
Rising Edge to Falling Edge
VSYNC = 0V
fSYNC = 100kHz, CME = CMF = 4700pF (Note 4)
4.1 4.5
0.5
0.5 1
7 15
VTMR
Timer Threshold Voltage
ITMR Timer Input Current
tTMRDIS
Timer Discharge Time
VTMRMAX
Timer Pin Clamp Voltage
Current Sense (Note 5)
VTMR = 0V
CTMR = 1000pF, RTMR = 4.7k
CTMR = 1000pF, RTMR = 4.7k
–10%
VCC/5
–6
40
2.5
10%
–10
120
ICS+
ICS
VCSMAX
VCS
CS+ Input Current
CSInput Current
CS+ Pin Clamp Voltage
Current Sense Threshold Voltage
VCS+ = 0V
VCS– = 0V
IIN = 5mA, Driver Off
VCS– = 0V
(Note 6)
7.5
3
±1
±1
11
10.5 13.5
18
SYNC Input
ISYNC
VSYNCP
SYNC Input Current
SYNC Input Positive Threshold
SYNC Positive Input Hysteresis
VSYNC = ±10V
(Note 7)
±1 ±10
1.0 1.4 1.8
0.2
VSYNCN
SYNC Input Negative Threshold
SYNC Negative Input Hysteresis
(Note 7)
–1.8 –1.4 –1.0
0.2
Driver Output
RONH
Driver Pull-Up Resistance
IOUT = –100mA
0.9 1.2
1.6
RONL
Driver Pull-Down Resistance
IOUT = 100mA
0.8 1.2
1.6
IPK
Driver Peak Output Current
(Note 7)
2
UNITS
V
V
V
mA
mA
V
µA
ns
V
µA
µA
V
mV
mV
µA
V
V
V
V
A
3901f
2


Part Number LTC3901
Description Secondary Side Synchronous Driver for Push-Pull and Full-Bridge Converters
Maker Linear Technology
Total Page 16 Pages
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