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參數(shù)資料
| 型號： | LTC1628IG-SYNC#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, 360 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-28 |
| 文件頁數(shù)： | 1/32頁 |
| 文件大?。?/td> | 658K |
| 代理商： | LTC1628IG-SYNC#TR |
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1
LTC1628-SYNC
1628syncfa
High Efficiency, 2-Phase
Synchronous Step-Down Switching Regulator
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter
■ Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
■ OPTI-LOOP
Compensation Minimizes COUT
■ Dual N-Channel MOSFET Synchronous Drive
■
±1% Output Voltage Accuracy
■ Power Good Output Voltage Monitor
■ Phase-Lockable Fixed Frequency 150kHz to 300kHz
■ Wide VIN 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 IQ: 20A
■ 5V and 3.3V Standby Regulators
■ Selectable Constant Frequency or Burst Mode
Operation
■ Small 28-Lead SSOP Package
The LTC
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 VOUT 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.
■ Notebook and Palmtop Computers, PDAs
■ Telecom Systems
■ Battery-Operated Digital Devices
■ DC Power Distribution Systems
APPLICATIO S
U
TYPICAL APPLICATIO
U
DESCRIPTIO
U
FEATURES
+
4.7
F
D3
D4
D1
M2
M1
CB1, 0.1F
R2
105k
1%
1000pF
L1
6.3
H
CC1
220pF
1
F
CERAMIC
CIN
22
F
50V
CERAMIC
+
COUT1
47
F
6V
SP
RSENSE1
0.01
R1
20k
1%
RC1
15k
VOUT1
5V
5A
D2
M4
M3
CB2, 0.1F
R4
63.4k
1%
L2
6.3
H
CC2
220pF
1000pF
+
COUT
56
F
6V
SP
RSENSE2
0.01
R3
20k
1%
RC2
15k
VOUT2
3.3V
5A
TG1
TG2
BOOST1
BOOST2
SW1
SW2
BG1
BG2
SGND
PGND
SENSE1+
SENSE2+
SENSE1–
SENSE2–
VOSENSE1
VOSENSE2
ITH1
ITH2
VIN PGOOD INTVCC
RUN/SS1
RUN/SS2
VIN
5.2V TO 28V
M1, M2, M3, M4: FDS6680A
1628 F01
CSS1
0.1
F
CSS2
0.1
F
LTC1628-SYNC
PLLIN
fIN
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 5481178, 5929620, 6177787, 6144194, 6100678, 5408150, 6580258, 6304066,
5705919.
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