1
LTC3700
3700f
LOAD CURRENT (mA)
1
90
86
82
78
74
70
66
62
58
54
50
10
100
1000
3700 F01a
V
OUT
= 1.8V
R
SENSE
= 0.068&
V
IN
= 3.3V
V
IN
= 5V
V
IN
= 4.2V
Constant Frequency
Step-Down DC/DC Controller
with LDO Regulator
The LTC
?/DIV>
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
controllers input supply, its own independent input supply
or the buck regulators 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 ?.5% output voltage accu-
racy. It consumes only 210礎 of quiescent current in nor-
mal operation with the LDO consuming an additional 50礎.
In shutdown, a mere 10礎 (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.
s
Notebook Computers
s
Portable Instruments
s
One or Two Li-Ion Battery-Powered Applications
s
Dual Output Regulator in Tiny 10-Pin MSOP
s
High Efficiency: Up to 94%
s
Wide V
IN
Range: 2.65V to 9.8V
s
Constant Frequency 550kHz Operation
s
150mA LDO Regulator with Current Limit and
Thermal Shutdown Protection
s
High Output Currents Easily Achieved
s
Burst Mode
?/DIV>
Operation at Light Load
s
Low Dropout: 100% Duty Cycle
s
Current Mode Operation for Excellent Line and Load
Transient Response
s
0.8V Reference Allows Low Output Voltages
s
Low Quiescent Current: 260礎 Total
s
Shutdown Mode Draws Only 10礎 Supply Current
s
Common Power Good Output for Both Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
+
SENSE
LTC3700
PGATE
V
FB
LDO
V
FB2
PGOOD
V
IN
V
IN2
I
TH
/RUN
GND
M1
L1
10礖
C2
47礔
6V
100k
80.6k
D1
10k
169k
C4
2.2礔
16V
78.7k
V
OUT2
2.5V AT
150mA
3700 F01
V
IN2
3.3V
V
OUT1
1.8V
AT 1A
C1, C3: TAIYO YUDEN EMK325BJ106MNT
C2: SANYO POSCAP 6TPA47M
C4: MURATA GRM42-6X7R225K016AL
D1: MOTOROLA MBRM120T3
L1: COILTRONICS UP1B-100
M1: Si3443DV
R1: DALE 0.25W
V
IN1
5V
C3
10礔
10V
C1
10礔
10V
R1
0.068&
220pF
Figure 1. High Efficiency 5V to 1.8V/1A Buck with 3.3V to 2.5V/150mA LDO
Buck Efficiency vs Load Current
DESCRIPTIO
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
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