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LTC1704/LTC1704B
1
1704bfa
DESCRIPTIO
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
The LTC
?/DIV>
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 ?.5% DC
accuracy at the switcher outputs and ?% at the linear
regulator outputs. High performance feedback loops allow
the circuit to keep total output regulation within ?%
under all transient conditions. An open-drain PGOOD
output indicates when both outputs are within ?0% of
their regulated values.
s
Multiple Logic Supply Generator
s
Distributed Power Applications
s
High Efficiency Power Conversion
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Dual Regulated Outputs: One Switching Regulator
and One Linear Regulator
s
Excellent DC Accuracy: ?/SPAN>1.5% for Switcher
and ?/SPAN>2% for Linear Regulator
s
External N-Channel MOSFET Architecture
s
No External Current Sense Resistor Required
s
Burst Mode
?/DIV>
 Operation at Light Load (LTC1704)
s
Continuous Switching at Light Load (LTC1704B)
s
Linear Regulator with Programmable Current Limit
s
Linear Regulator with Programmable Start-Up Delay
s
Low Shutdown Current: <150礎
s
High Efficiency Over Wide Load Current Range
s
PGOOD Flag Monitors Both Outputs
s
Small 16-Pin Narrow SSOP Package
550kHz Synchronous
Switching Regulator Controller
Plus Linear Regulator Controller
Burst Mode is a registered trademark of Linear Technology Corporation.
5V to 1.8V/15A and 1.5V/2A Application
BOOST
TG
SW
PGOOD
REGILM
C
CP
1礔
10&
13.7k
11k
1.8k
10k
8.06k
1800pF
5k
470k
10礔
10礔
MBR0520LT1
16
1
2
QTB
1礔
L1
0.68礖
11
12
10
0.1礔
1000pF
ON SEMI
D44H11
698&
806&
RUN/SS
4
GND
8
REGDR
7
REGFB
9
1704 TA01
PV
CC
LTC1704
V
CC
QTA
BG
14
I
MAX
3
PGND
13
COMP
5
FB
6
QBA
QBB
+
100礔
TANT
V
OUTREG
1.5V
2A
V
OUTSW
330pF
1800pF
C
IN
: KEMET T510X337K010AS
C
OUTSW
: PANASONIC EEFUE0G181R
L: SUMIDA CEP125-4712-T007
QTA, QTB, QBA, QBB: FAIRCHILD FDS6670A
+
+
C
OUTSW
180礔
4V
?
C
IN
330礔
10V
?
V
IN
5V
V
OUTSW
1.8V
15A
+
+
15
I
LOAD
 (A)
0
80
90
100
12
1704 G04
70
60
50
3    6    9
15
V
IN
 = 5V
V
OUTSW
 = 1.8V
T
A
 = 25癈
QT = QB = 2xFDS6670A
Switcher Efficiency
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