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LTC1702ACGN Datasheet

  • LTC1702ACGN

  • SMPS Controller

  • 36頁

  • ETC

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FEATURES
s
s
s
s
LTC1702A
Dual 550kHz Synchronous
2-Phase Switching Regulator Controller
DESCRIPTIO
The LTC
廬
1702A is a dual switching regulator controller
optimized for high efficiency with low input voltages. It
includes two complete, on-chip, independent switching regu-
lator controllers each designed to drive a pair of external N-
channel MOSFETs in a voltage mode feedback, synchronous
buck configuration. The LTC1702A uses a constant-fre-
quency, true PWM design switching at 550kHz, minimizing
external component size and cost and maximizing load
transient performance. The synchronous buck architecture
automatically shifts to discontinuous and then to Burst
Mode
廬
operation as the output load decreases, ensuring
maximum efficiency over a wide range of load currents.
The LTC1702A features an onboard reference trimmed to
0.5% and can provide better than 1% regulation at the
converter outputs. Open-drain logic outputs indicate whether
either output has risen to within 5% of the final output voltage
and an optional latching FAULT mode protects the load if the
output rises 15% above the intended voltage. Each channel
can be enabled independently; with both channels disabled,
the LTC1702A shuts down and supply current drops below
100碌A(chǔ).
s
s
s
s
s
s
s
Pin Compatible with the LTC1702 with Improved
Current Limit Control
Two Sides Run Out-of-Phase to Minimize C
IN
No External Current Sense Resistors
Excellent Output Regulation: 1% Total Output
Accuracy
Two Independent Controllers in One Package
All N-Channel External MOSFET Architecture
550kHz Switching Frequency Minimizes External
Component Size
1A to 25A Output Current per Channel
High Efficiency over Wide Load Current Range
Less Than 100碌A(chǔ) Shutdown Current
Small 24-Pin Narrow SSOP Package
APPLICATIO S
s
s
s
s
Microprocessor, DSP Core and I/O Supplies
Multiple Logic Supply Generator
Distributed Power Applications
High Efficiency Power Conversion
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
C
OUT1
, C
OUT2
: PANASONIC EEFUE0G181R
C
IN
: KEMET TS10X337M010AS
D1, D2: MOTOROLA MBR0520LT1
D3, D4: MOTOROLA MBRS320T3
L1, L2: SUMIDA CEP125-1R0
Q1 TO Q8: FAIRCHILD FDS6670A
1碌F
Dual Output High Power 3.3V/2.5V Logic Supply
V
IN
= 5V
鹵10%
D1
D2
1碌F
1
1碌F
2
3
Q1
Q2
4
5
Q3
Q4
11.8k
6
PV
CC
BOOST1
BG1
TG1
SW1
I
MAX1
I
MAX2
BOOST2
BG2
TG2
SW2
PGND
10鈩?/div>
24
23
22
10碌F
+
11.8k
10碌F
Q5
Q6
L2
1碌H
Q7
Q8
D4
1.6k
15.8k
1%
V
OUT2
3.3V
AT 15A
1碌F
V
OUT1
2.5V
AT 15A
1碌F
L1
1碌H
D3
1.2k
10k
1%
820pF
21
20
19
+
C
OUT1
180碌F
脳4
4.75k
1%
V
IN
10k
PWRGD1
47k
680pF
27pF
LTC1702A
7
18
PGOOD1
PGOOD2
8
17
FCB
FAULT
9
16
RUN/SS
RUN/SS2
1碌F
10
15
COMP1
COMP2
11
14
SGND
FB2
12
13
FB1
V
CC
1碌F
68k
27pF
3300pF
10k
PWRGD2
FAULT
1702 TA01
U
U
U
C
IN
330碌F
脳3
+
680pF
C
OUT2
180碌F
脳4
1碌F
4.99k
1%
V
IN
1702af
1

LTC1702ACGN 產(chǎn)品屬性

  • 55

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • PolyPhase®

  • 電壓模式

  • 2

  • 750kHz

  • 93%

  • 3 V ~ 7 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 0°C ~ 70°C

  • 24-SSOP（0.154"，3.90mm 寬）

  • 管件

LTC1702ACGN相關(guān)型號PDF文件下載

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