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LTC1704 Datasheet

  • LTC1704

  • 550kHz Synchronous Switching Regulator Controller Plus Linea...

  • 28頁

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LTC1704/LTC1704B
550kHz Synchronous
Switching Regulator Controller
Plus Linear Regulator Controller
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
Dual Regulated Outputs: One Switching Regulator
and One Linear Regulator
Excellent DC Accuracy:
鹵1.5%
for Switcher
and
鹵2%
for Linear Regulator
External N-Channel MOSFET Architecture
No External Current Sense Resistor Required
Burst Mode
廬
Operation at Light Load (LTC1704)
Continuous Switching at Light Load (LTC1704B)
Linear Regulator with Programmable Current Limit
Linear Regulator with Programmable Start-Up Delay
Low Shutdown Current: <150碌A(chǔ)
High Efficiency Over Wide Load Current Range
PGOOD Flag Monitors Both Outputs
Small 16-Pin Narrow SSOP Package
APPLICATIO S
s
s
s
The LTC
廬
1704/LTC1704B include a high power synchro-
nous switching regulator controller plus a linear regulator
controller. The switching regulator controller is designed
to drive a pair of N-channel MOSFETs in a voltage mode,
synchronous buck configuration to provide the main sup-
ply. The constant frequency, true PWM architecture
switches at 550kHz, minimizing external component size,
cost and optimizing load transient performance. The
LTC1704 features automatic transition to power saving
Burst Mode operation at light loads. The LTC1704B does
not shift into Burst Mode operation at light loads, eliminat-
ing low frequency output ripple at the expense of light load
efficiency. The linear regulator controller is designed to
drive an external NPN power transistor to provide up to 2A
of current to an auxiliary load.
The LTC1704/LTC1704B deliver better than
鹵1.5%
DC
accuracy at the switcher outputs and
鹵2%
at the linear
regulator outputs. High performance feedback loops allow
the circuit to keep total output regulation within
鹵5%
under all transient conditions. An open-drain PGOOD
output indicates when both outputs are within
鹵10%
of
their regulated values.
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
V
IN
5V
C
IN
330碌F
10V
脳3
5V to 1.8V/15A and 1.5V/2A Application
10鈩?/div>
+
1碌F
MBR0520LT1
+
10碌F
11
V
CC
PGOOD
REGILM
RUN/SS
LTC1704
+
5k
470k
10碌F
100
L1
0.68碌H
V
OUTSW
1.8V
15A
C
OUTSW
180碌F
4V
脳6
QTA
QTB
+
QBB
QBA
14
13.7k 3
BG
4
0.1碌F
1000pF
EFFICIENCY (%)
16 15
C
CP
1碌F BOOST PV
CC
1
TG
2
SW
12
10
I
MAX
PGND
FB
COMP
GND
REGDR
8
V
OUTSW
7
ON SEMI
D44H11
698鈩?/div>
806鈩?/div>
1704 TA01
10k
1800pF
1.8k
13
6
8.06k
1800pF
11k
330pF
5
REGFB
9
+
100碌F
TANT
V
OUTREG
1.5V
2A
C
IN
: KEMET T510X337K010AS
C
OUTSW
: PANASONIC EEFUE0G181R
L: SUMIDA CEP125-4712-T007
QTA, QTB, QBA, QBB: FAIRCHILD FDS6670A
U
Switcher Efficiency
90
80
70
V
IN
= 5V
V
OUTSW
= 1.8V
T
A
= 25擄C
QT = QB = 2xFDS6670A
0
3
9
6
I
LOAD
(A)
12
15
1704 G04
U
U
60
50
1704bfa
1

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