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LTC1628-SYNC Datasheet

  • LTC1628-SYNC

  • High Efficiency, 2-Phase Synchronous Step-Down Switching Reg...

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LTC1628-SYNC
High Efficiency, 2-Phase
Synchronous Step-Down Switching Regulator
FEATURES
s
s
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s
s
s
s
s
s
s
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DESCRIPTIO
Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
OPTI-LOOP
TM
Compensation Minimizes C
OUT
Dual N-Channel MOSFET Synchronous Drive
鹵1%
Output Voltage Accuracy
Power Good Output Voltage Monitor
Phase-Lockable Fixed Frequency 150kHz to 300kHz
Wide V
IN
Range: 3.5V to 36V Operation
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Soft-Start Current Ramping
Foldback Output Current Limiting
Latched Short-Circuit Shutdown with Defeat Option
Output Overvoltage Protection
Remote Output Voltage Sense
Low Shutdown I
Q
: 20碌A(chǔ)
5V and 3.3V Standby Regulators
Small 28-Lead SSOP Package
Selectable Constant Frequency or Burst Mode
TM
Operation
The LTC
廬
1628-SYNC is a high performance dual step-
down switching regulator controller that drives all
N-channel synchronous power MOSFET stages. A con-
stant frequency current mode architecture allows phase-
lockable frequency of up to 300kHz. Power loss and noise
due to the ESR of the input capacitors are minimized by
operating the two controller output stages out of phase.
OPTI-LOOP compensation allows the transient response
to be optimized over a wide range of output capacitance and
ESR values. The precision 0.8V reference and power good
output indicator are compatible with future microproces-
sor generations, and a wide 3.5V to 30V (36V maximum)
input supply range encompasses all battery chemistries.
A RUN/SS pin for each controller provides both soft-start
and optional timed, short-circuit shutdown. Current
foldback limits MOSFET dissipation during short-circuit
conditions when overcurrent latchoff is disabled. Output
overvoltage protection circuitry latches on the bottom
MOSFET until V
OUT
returns to normal. The FCB mode pin
can select among Burst Mode, constant frequency mode
and continuous inductor current mode or regulate a
secondary winding. The LTC1628-SYNC includes a power
good output pin that indicates when both outputs are
within 7.5% of their designed set point.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
APPLICATIO S
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Notebook and Palmtop Computers, PDAs
Telecom Systems
Portable Instruments
Battery-Operated Digital Devices
DC Power Distribution Systems
TYPICAL APPLICATIO
L1
6.3碌H
+
4.7碌F
M1
C
B1
, 0.1碌F
D3
V
IN
PGOOD INTV
CC
TG1
BOOST1
SW1
BG1
f
IN
LTC1628-SYNC
TG2
BOOST2
SW2
BG2
PGND
SENSE2
+
1000pF
SENSE1
鈥?/div>
V
OSENSE1
SENSE2
鈥?/div>
V
OSENSE2
I
TH2
C
SS2
0.1碌F
C
C2
220pF
R
C2
15k
D4
1碌F
CERAMIC
M3
C
B2
, 0.1碌F
D1
M2
PLLIN
SENSE1
+
R
SENSE1
0.01鈩?/div>
V
OUT1
5V
5A
1000pF
+
C
OUT1
47碌F
6V
SP
R2
105k
1%
R1
20k
1%
C
C1
220pF
R
C1
15k
I
TH1
C
SS1
0.1碌F
RUN/SS1 SGND RUN/SS2
M1, M2, M3, M4: FDS6680A
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter
U
V
IN
5.2V TO 28V
C
IN
22碌F
50V
CERAMIC
L2
6.3碌H
M4
D2
R
SENSE2
0.01鈩?/div>
V
OUT2
3.3V
5A
C
OUT
56碌F
6V
SP
R3
20k
1%
R4
63.4k
1%
U
U
+
1628 F01
1

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