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LTC1702IGN Datasheet

  • LTC1702IGN

  • Dual 550kHz Synchronous 2-Phase Switching Regulator Controll...

  • 353.30KB

  • 36頁

  • LINER

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LTC1702
Dual 550kHz Synchronous
2-Phase Switching Regulator Controller
FEATURES
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
Two Independent Controllers in One Package
Two Sides Run Out-of-Phase to Minimize C
IN
All N-Channel External MOSFET Architecture
No External Current Sense Resistors
Excellent Output Regulation: 1% Total Output
Accuracy
550kHz Switching Frequency Minimizes External
Component Size
1A to 25A Output Current per Channel
High Efficiency over Wide Load Current Range
Quiescent Current Drops Below 100碌A(chǔ) in Shutdown
Small 24-Pin Narrow SSOP Package
APPLICATIO S
s
s
s
s
Microprocessor 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 trademark of Linear Technology Corporation.
The LTC
廬
1702 is a dual switching regulator controller opti-
mized for high efficiency with low input voltages. It includes
two complete, on-chip, independent switching regulator
controllers each designed to drive a pair of external N-channel
MOSFET devices in a voltage mode feedback, synchronous
buck configuration. The LTC1702 uses a constant-frequency,
true PWM design switching at 550kHz, minimizing external
component size and cost and maximizing load transient
performance. The synchronous buck architecture automati-
cally shifts to discontinuous and then to Burst Mode
TM
operation as the output load decreases, ensuring maximum
efficiency over a wide range of load currents.
The LTC1702 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 LTC1702 shuts down and supply current drops below
100碌A(chǔ).
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
27k
10碌F
Q5
21
20
19
18
17
16
15
14
13
27pF
1碌F
68k
3300pF
10k
PWRGD2
FAULT
1702 TA01
D2
1碌F
1
1碌F
2
3
Q1
Q2
4
5
PV
CC
BOOST1
BG1
TG1
SW1
I
MAX1
PGOOD1
FCB
RUN/SS
COMP1
SGND
FB1
LTC1702
I
MAX2
BOOST2
BG2
TG2
SW2
PGND
PGOOD2
FAULT
RUN/SS2
COMP2
FB2
V
CC
10鈩?/div>
24
23
22
10碌F
+
V
OUT1
2.5V
AT 15A
1碌F
L1
1碌H
27k
+
C
OUT1
180碌F
脳4
D3
1.2k
10k
1%
Q3
Q4
6
7
8
820pF
9
1碌F
10
4.75k
1%
V
IN
10k
PWRGD1
47k
680pF
27pF
11
12
U
C
IN
330碌F
脳3
1碌F
Q6
L2
1碌H
V
OUT2
3.3V/15A
Q7
Q8
D4
1.6k
15.8k
1%
U
U
+
680pF
C
OUT2
180碌F
脳4
1碌F
4.99k
1%
V
IN
1

LTC1702IGN 產(chǎn)品屬性

  • LTC1702

  • 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

  • -40°C ~ 85°C

  • 24-SSOP（0.154"，3.90mm 寬）

  • 管件

LTC1702IGN相關(guān)型號(hào)PDF文件下載

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    Programmable Micropower Hex Translator/ Receiver/Driver
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    “Inductorless” 5V to + 5V Converter
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