LTC1628-SYNC Datasheet PDF - Linear
| Part Number | LTC1628-SYNC | |
| Description | 2-Phase Synchronous Step-Down Switching Regulator | |
| Manufacturers | Linear | |
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LTC1628-SYNC
High Efficiency, 2-Phase
Synchronous Step-Down Switching Regulator
FEATURES
■ 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: 20µA
■ 5V and 3.3V Standby Regulators
■ Selectable Constant Frequency or Burst Mode®
Operation
■ Small 28-Lead SSOP Package
U
APPLICATIO S
■ Notebook and Palmtop Computers, PDAs
■ Telecom Systems
■ Battery-Operated Digital Devices
■ DC Power Distribution Systems
DESCRIPTIO
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.
, 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.
TYPICAL APPLICATIO
L1
6.3µH
D1
VOUT1
5V
5A
RSENSE1
0.01Ω
+
COUT1
47µF
6V
SP
R2
105k
1%
+
4.7µF
M1
CB1, 0.1µF
M2
D3
VIN PGOOD INTVCC
TG1 TG2
BOOST1
BOOST2
SW1 SW2
LTC1628-SYNC
BG1 BG2
1µF
D4 CERAMIC
CB2, 0.1µF
M3
M4
fIN
1000pF
PLLIN
SENSE1+
SENSE1–
PGND
SENSE2+
SENSE2–
1000pF
VOSENSE1
VOSENSE2
ITH1 ITH2
R1
CC1
220pF
RUN/SS1 SGND RUN/SS2
CC2
220pF
20k
1%
RC1
15k
CSS1
0.1µF
CSS2
0.1µF
RC2
15k
R3
20k
1%
VIN
CIN 5.2V TO 28V
22µF
50V
CERAMIC
L2
6.3µH
D2
R4
63.4k
1%
RSENSE2
0.01Ω
VOUT2
3.3V
5A
COUT
56µF
6V
SP
+
M1, M2, M3, M4: FDS6680A
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter
1628 F01
1628syncfa
1
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TYPICAL PERFOR A CE CHARACTERISTICS
LTC1628-SYNC
Internal 5V LDO Line Regulation
5.1
ILOAD = 1mA
5.0
4.9
4.8
4.7
4.6
4.5
4.4
0
5 10 15 20 25 30 35
INPUT VOLTAGE (V)
1628 G07
Maximum Current Sense Threshold
vs VRUN/SS (Soft-Start)
80
VSENSE(CM) = 1.6V
60
40
20
0
01
2 34
VRUN/SS (V)
56
1628 G10
Load Regulation
0.0
–0.1
FCB = 0V
VIN = 15V
FIGURE 1
–0.2
–0.3
–0.4
0
1 2 34
LOAD CURRENT (A)
5
1628 G13
Maximum Current Sense Threshold
vs Duty Factor
75
50
25
0
0 20 40 60 80 100
DUTY FACTOR (%)
1628 G08
Maximum Current Sense Threshold
vs Sense Common Mode Voltage
80
76
72
68
64
60
0
1 2 34
COMMON MODE VOLTAGE (V)
5
1628 G11
VITH vs VRUN/SS
2.5
VOSENSE = 0.7V
2.0
1.5
1.0
0.5
0
012 34
VRUN/SS (V)
56
1628 G14
Maximum Current Sense Threshold
vs Percent of Nominal Output
Voltage (Foldback)
80
70
60
50
40
30
20
10
0
0 25 50 75 100
PERCENT ON NOMINAL OUTPUT VOLTAGE (%)
1628 G09
Current Sense Threshold
vs ITH Voltage
90
80
70
60
50
40
30
20
10
0
–10
–20
–30
0 0.5 1 1.5 2 2.5
VITH (V)
1628 G12
SENSE Pins Total Source Current
100
50
0
–50
–100
0
246
VSENSE COMMON MODE VOLTAGE (V)
1628 G15
1628syncfa
5
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for LTC1628-SYNC electronic component. |
| Information | Total 30 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ LTC1628-SYNC.PDF Datasheet ] | |
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