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LTC3722EGN-2#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
LTC3722-1/LTC3722-2
1
372212fb
For more information www.linear.com/LTC3722
TYPICAL APPLICATION
FEATURES DESCRIPTION
Synchronous Dual Mode
Phase Modulated
Full Bridge Controllers
The LTC
®
3722-1/LTC3722-2 phase-shift PWM controllers
provide all of the control and protection functions neces-
sary to implement a high efficiency, zero voltage switched
(ZVS), full bridge power converter. Adaptive ZVS circuitry
delays the turn-on signals for each MOSFET independent
of internal and external component tolerances. Manual
delay set mode enables secondary side control operation
or direct control of switch turn-on delays.
The LTC3722-1/LTC3722-2 feature adjustable synchron-
ous rectifier timing for optimal efficiency. A UVLO program
input provides accurate system turn-on and turn-off
voltages. The LTC3722-1 features peak current mode
control with programmable slope compensation and
leading edge blanking, while the LTC3722-2 employs
voltage mode control.
The LTC3722-1/LTC3722-2 feature extremely low operating
and start-up currents. Both devices include a full range of
protection features and are available in the 24-pin surface
mount GN package.
12V
OUT
, 240W Converter Efficiency
APPLICATIONS
n
Adaptive or Manual Delay Control for Zero Voltage
Switching Operation
n
Adjustable Synchronous Rectification Timing for
Highest Efficiency
n
Adjustable Maximum ZVS Delay
n
Adjustable System Undervoltage Lockout Hysteresis
n
Programmable Leading Edge Blanking
n
Very Low Start-Up and Quiescent Currents
n
Current Mode (LTC3722-1) or Voltage Mode
(LTC3722-2) Operation
n
Programmable Slope Compensation
n
V
CC
UVLO and 25mA Shunt Regulator
n
50mA Output Drivers
n
Soft-Start, Cycle-by-Cycle Current Limiting and
Hiccup Mode Short-Circuit Protection
n
5V, 15mA Low Dropout Regulator
n
24-Pin Surface Mount GN Package
n
Telecommunications, Infrastructure Power Systems
n
Distributed Power Architectures
n
Server Power Supplies
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
DirectSense is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
C
IN
R1
LTC3722
V
IN
36V TO
72V
MA
ME
MF
MB
MC
MD
U1
U2
U3
L1
L2
RCS
T1
T2
C1
V
OUT
12V
C
OUT
372212 TA01a
U1, U2: LTC4440 GATE DRIVER
U3: LTC3901 GATE DRIVER
CURRENT (A)
0
EFFICIENCY (%)
95
90
85
80
75
16
372212 TA01b
42 6 10 14 18
8
12
20
36V
IN
72V
IN
48V
IN
LTC3722-1/LTC3722-2
2
372212fb
For more information www.linear.com/LTC3722
ABSOLUTE MAXIMUM RATINGS
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) ...................................................25mA
(Note 1)
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3722EGN-1#PBF LTC3722EGN-1#TRPBF LTC3722EGN-1 24-Lead Plastic SSOP –40°C to 85°C
LTC3722EGN-2#PBF LTC3722EGN-2#TRPBF LTC3722EGN-2 24-Lead Plastic SSOP –40°C to 85°C
LTC3722IGN-1#PBF LTC3722IGN-1#TRPBF LTC3722IGN-1 24-Lead Plastic SSOP –40°C to 85°C
LTC3722IGN-2#PBF LTC3722IGN-2#TRPBF LTC3722IGN-2 24-Lead Plastic SSOP –40°C to 85°C
LTC3722HGN-1#PBF LTC3722HGN-1#TRPBF LTC3722HGN-1 24-Lead Plastic SSOP –40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
V
REF
Output Current ................................. Self Regulated
Outputs (A, B, C, D, E, F) Current
.......................±100mA
Operating Junction Temperature Range
(Note 6)
.................................................. –40°C to 150°C
Storage Temperature Range
.................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
...................300°C
LTC3722-1 LTC3722-2
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
GN PACKAGE
24-LEAD NARROW PLASTIC SSOP
24
23
22
21
20
19
18
17
16
15
14
13
SYNC
DPRG
CS
COMP
RLEB
FB
SS
NC
PDLY
SBUS
ADLY
UVLO
C
T
GND
PGND
OUTA
OUTB
OUTC
V
CC
OUTD
OUTE
OUTF
V
REF
SPRG
T
JMAX
= 125°C, θ
JA
= 100°C/W
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
GN PACKAGE
24-LEAD NARROW PLASTIC SSOP
24
23
22
21
20
19
18
17
16
15
14
13
SYNC
RAMP
CS
COMP
DPRG
FB
SS
NC
PDLY
SBUS
ADLY
UVLO
C
T
GND
PGND
OUTA
OUTB
OUTC
V
CC
OUTD
OUTE
OUTF
V
REF
SPRG
T
JMAX
= 125°C, θ
JA
= 100°C/W
LTC3722-1/LTC3722-2
3
372212fb
For more information www.linear.com/LTC3722
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Supply
V
CCUV
V
CC
Under Voltage Lockout Measured on V
CC
10.25 10.5 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
LTC3722E-1/LTC3722I-1/LTC3722E-2/LTC3722I-2
LTC3722H-1
l
l
145
145
230
250
µA
µA
I
CCRN
Operating Current No Load on Outputs 5 8 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 1.1 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 8.5 10 11.5 µA
Delay Blocks
DTHR Delay Pin Threshold
ADLY and PDLY
SBUS = 1.5V
SBUS = 2.25V
l
l
1.4
2.1
1.5
2.25
1.6
2.4
V
V
DHYS Delay Hysteresis Current
ADLY and PDLY
SBUS = 1.5V, ADLY/PDLY = 1.7V 1.3 mA
DTMO Delay Timeout R
DPRG
= 60.4K 100 ns
DFXT
Fixed Delay Threshold Measured on SBUS 4 V
DFTM Fixed Delay Time SBUS = V
REF
, ADLY, PDLY = 1V 70 ns
Phase Modulator
I
CS
CS Discharge Current CS = 1V, COMP = 0V, C
T
= 4V,
LTC3722-1 Only
50 mA
I
SLP
Slope Compensation Current Measured on CS, C
T
= 1V
C
T
= 2.25V
30
68
µA
µA
DC
MAX
Maximum Phase Shift COMP = 4.5V
l
95 98.5 %
DC
MIN
Minimum Phase Shift COMP = 0V
l
0 0.5 %
Oscillator
OSCI Initial Accuracy T
A
= 25°C, C
T
= 270pF 225 250 275 kHz
OSCT Total Variation V
CC
= 6.5V to 9.5V
l
215 250 285 kHz
OSCV C
T
Ramp Amplitude Measured on C
T
2.2 V
OSYT SYNC Threshold Measured on SYNC 1.6 1.9 2.2 V
OSYW Minimum SYNC Pulse Width Measured at Outputs (Note 2) 100 ns
OSYR SYNC Frequency Range Measured at Outputs (Note 2) 1000 kHz
Error Amplifier
V
FB
FB Input Voltage COMP = 2.5V (Note 4) 1.172 1.204 1.236 V
FBI FB Input Range Measured on FB (Note 5) –0.3 2.5 V
A
VOL
Open-Loop Gain COMP = 1V to 3V (Note 4) 70 90 dB
IIB Input Bias Current COMP = 2.5V (Note 4) 5 20 nA
V
OH
Output High Load on COMP = –100µA 4.7 4.92 V
V
OL
Output Low Load on COMP = 100µA 0.18 0.4 V
I
SOURCE
Output Source Current COMP = 2.5V 400 800 µA
I
SINK
Output Sink Current COMP = 2.5V 2 5 mA
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 9.5V, C
T
= 270pF, R
DPRG
= 60.4k, R
SPRG
= 100k, unless
otherwise noted (Note 6).
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

LTC3722EGN-2#PBF

Mfr. #:
Buy LTC3722EGN-2#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Sync 2x Mode PhModulated Full Bridge Cnt
Lifecycle:
New from this manufacturer.
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