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LTC3700 Datasheet

  • LTC3700

  • Constant Frequency Step-Down DC/DC Controller with LDO Regul...

  • 16頁

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FEATURES
s
s
s
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LTC3700
Constant Frequency
Step-Down DC/DC Controller
with LDO Regulator
DESCRIPTIO
The LTC
廬
3700 is a constant frequency current mode step-
down (buck) DC/DC controller with excellent AC and DC
load and line regulation. The on-chip 150mA low dropout
(LDO) linear regulator can be powered from the buck
controller鈥檚 input supply, its own independent input supply
or the buck regulator鈥檚 output. The buck controller incor-
porates an undervoltage lockout feature that shuts down the
controller when the input voltage falls below 2.1V.
The buck regulator provides a
鹵2.5%
output voltage accu-
racy. It consumes only 210碌A(chǔ) of quiescent current in nor-
mal operation with the LDO consuming an additional 50碌A(chǔ).
In shutdown, a mere 10碌A(chǔ) (combined) is consumed.
For applications where efficiency is a prime consideration,
the buck controller is configured for Burst Mode operation
which enhances efficiency at low output current. To fur-
ther maximize the life of a battery source, the external
P-channel MOSFET is turned on continuously in dropout
(100% duty cycle). High constant operating frequency of
550kHz allows the use of a small external inductor.
The LDO is protected by both current limit and thermal
shutdown circuits.
The LTC3700 is available in a tiny 10-pin MSOP.
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Dual Output Regulator in Tiny 10-Pin MSOP
High Efficiency: Up to 94%
Wide V
IN
Range: 2.65V to 9.8V
Constant Frequency 550kHz Operation
150mA LDO Regulator with Current Limit and
Thermal Shutdown Protection
High Output Currents Easily Achieved
Burst Mode
廬
Operation at Light Load
Low Dropout: 100% Duty Cycle
Current Mode Operation for Excellent Line and Load
Transient Response
0.8V Reference Allows Low Output Voltages
Low Quiescent Current: 260碌A(chǔ) Total
Shutdown Mode Draws Only 10碌A(chǔ) Supply Current
Common Power Good Output for Both Supplies
APPLICATIO S
s
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Notebook Computers
Portable Instruments
One or Two Li-Ion Battery-Powered Applications
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
V
IN1
5V
C1
10碌F
10V
R1
0.068鈩?/div>
V
IN
SENSE
鈥?/div>
PGATE
V
IN2
LDO
169k
V
FB2
78.7k
C3
10碌F
10V
V
IN2
3.3V
90
V
OUT2
2.5V AT
150mA
86
82
78
EFFICIENCY (%)
V
OUT1
1.8V
AT 1A
C2
47碌F
6V
L1
10碌H
100k
M1
C4
2.2碌F
16V
D1
LTC3700
+
80.6k
V
FB
10k
I
TH
/RUN
220pF
GND
PGOOD
C1, C3: TAIYO YUDEN EMK325BJ106MNT
C2: SANYO POSCAP 6TPA47M
C4: MURATA GRM42-6X7R225K016AL
D1: MOTOROLA MBRM120T3
L1: COILTRONICS UP1B-100
M1: Si3443DV
3700 F01
R1: DALE 0.25W
Figure 1. High Efficiency 5V to 1.8V/1A Buck with 3.3V to 2.5V/150mA LDO
U
U
U
Buck Efficiency vs Load Current
V
OUT
= 1.8V
R
SENSE
= 0.068鈩?/div>
V
IN
= 3.3V
74
70
66
62
58
54
50
1
V
IN
= 4.2V
V
IN
= 5V
10
100
LOAD CURRENT (mA)
1000
3700 F01a
3700f
1

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