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LTC3802 Datasheet

  • LTC3802

  • Linear Technology [Dual 550kHz Synchronous 2-Phase DC/DC Co...

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LTC3802
Dual 550kHz Synchronous
2-Phase DC/DC Controller with
Programmable Up/Down Tracking
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
Wide V
IN
Range: 3V to 30V Operation with Line
Feedforward Compensation
Leading Edge Modulation Architecture for
Extremely Low Duty Cycle Operation
Phase-Lockable Fixed Frequency: 330kHz to 750kHz
Two 180掳 Out-of-Phase Controllers
Fast Programmable Power-Up/-Down Tracking
Programmable Current Limit Without External
Current Sense Resistor
Optional Burst Mode
庐
Operation at Light Load
卤1%
0.6V Voltage Reference
External N-Channel MOSFET Architecture
Low Shutdown Current: <100碌A
Overvoltage Protection and PGOOD Flag
Small 28-Lead SSOP and 32-Lead QFN Packages
The LTC
庐
3802 is a dual switching regulator controller
optimized for high efficiency step-down conversion from
input voltages between 3V to 30V. The controller uses a
leading edge modulation scheme to allow extremely low
duty cycle operation. The constant frequency voltage mode
controller allows a phase-lockable frequency between
330kHz and 750kHz. Power loss and noise due to the ESR
of the input capacitors are minimized by operating the two
controller output stages 180掳 out of phase. The synchro-
nous buck architecture automatically shifts to Burst Mode
operation as the output load decreases, ensuring maxi-
mum efficiency over a wide range of load currents.
The LTC3802 features an onboard, trimmed 0.6V refer-
ence and provides better than 1% regulation at the con-
verter outputs. A separate output sense provides real time
overvoltage protection and PGOOD sensing. An FBT pin
programs the power-up/-down tracking between the two
channels to meet various sequencing requirements. A
RUN/SS pin provides soft-start and externally program-
mable current limit protection functions.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
U.S. Patent Nos 5481178, 5846544, 6304066, 6580258, 5055767, 6307356
APPLICATIO S
s
s
s
s
Notebook and Palmtop Computers
Portable Instruments
Battery-Operated Digital Devices
DC Power Distribution Systems
TYPICAL APPLICATIO
V
IN
5V TO 22V
+
56碌F
25V
脳2
4.7碌F
25V
脳8
1碌H
5V
CMDSH-3
Si7860DP
脳2
0.1碌F
+
CMDSH-3
TG1
PV
CC
TG2
BOOST2
10碌F
Si7860DP
脳2
1碌H
0.1碌F
Si7440DP
脳2
47k
B340B
330碌F
4V
脳3
V
OUT2
2.5V
15A
V
OUT1
3.3V
15A
10k
10k
B340B
+
330碌F
4V
脳3
560pF
Si7440DP
脳2
47k
SW2
BOOST1
BG2
SW1
PLLIN
BG1
PLLLPF
PGND
LTC3802
I
MAX2
I
MAX1
FBT
CMPIN1
COMP1
FB1
SGND
FCB
RUN/SS
0.1碌F
CMPIN2
V
CC
COMP2
FB2
PHASEMD
V
INFF
PGOOD
10k
5V
2.21k
2.21k
1500pF
390鈩?/div>
15k
330pF
2200pF
+
0.1碌F
330pF
3802 TA01
V
IN
0.47碌F
U
+
10k
10k
3.16k
5V
10鈩?/div>
10碌F
2200pF
15k
560pF
1500pF
390鈩?/div>
3.16k
U
U
3802f
1

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