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LTC3801BES6 Datasheet

  • LTC3801BES6

  • Micropower Constant Frequency Step-Down DC/DC Controllers in...

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LTC3801/LTC3801B
Micropower
Constant Frequency Step-Down
DC/DC Controllers in ThinSOT
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
s
High Efficiency: Up to 94%
Very Low No-Load Quiescent Current:
Only 16碌A(chǔ) (LTC3801)
High Output Currents Easily Achieved
Internal Soft-Start
Wide V
IN
Range: 2.4V to 9.8V
Low Dropout: 100% Duty Cycle
Constant Frequency 550kHz Operation
Burst Mode
廬
Operation for High Efficiency
at Light Loads (LTC3801)
Burst Mode Operation Disabled for Lower Output
Ripple at Light Loads (LTC3801B)
Output Voltage as Low as 0.8V
鹵1.5%
Voltage Reference Accuracy
Current Mode Operation for Excellent Line and Load
Transient Response
Only 6碌A(chǔ) Supply Current in Shutdown (LTC3801)
Low Profile (1mm) SOT-23 Package
The LTC
廬
3801/LTC3801B are constant frequency cur-
rent mode step-down DC/DC controllers in a low profile
(1mm max) 6-lead SOT-23 (ThinSOT
TM
) package. The
parts provide excellent AC and DC load and line regula-
tion with
鹵1.5%
output voltage accuracy. The LTC3801
consumes only 195碌A(chǔ) of quiescent current in normal
operation, dropping to 16碌A(chǔ) under no-load conditions.
The LTC3801/LTC3801B incorporate an undervoltage lock-
out feature that shuts down the device when the input
voltage falls below 2.2V. The LTC3801 automatically
switches into Burst Mode operation at light loads which
enhances efficiency at low output current. In the LTC3801B,
Burst Mode operation is disabled for lower output ripple at
light loads.
To further maximize the life of a battery source, the
external P-channel MOSFET is turned on continuously in
dropout (100% duty cycle). High switching frequency of
550kHz allows the use of a small inductor.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
1- or 2-Cell Li-Ion Battery-Powered Applications
Wireless Devices
Portable Computers
Distributed Power Systems
TYPICAL APPLICATIO
LTC3801 Efficiency vs Load Current*
100
95
V
OUT
= 2.5V
V
IN
= 4.2V
V
IN
= 3.3V
550kHz Micropower Step-Down DC/DC Controller
10k
V
IN
I
TH
/RUN
LTC3801/
LTC3801B
GND
SENSE
鈥?/div>
V
FB
402k
866k
4.7碌H
V
OUT
2.5V
2A
PGATE
0.025鈩?/div>
10碌F
V
IN
2.7V TO 9.8V
EFFICIENCY (%)
90
85
80
75
70
65
60
55
50
0.1
1
10
100
1000
LOAD CURRENT (mA)
10000
V
IN
= 9.8V
V
IN
= 8.4V
V
IN
= 6.6V
220pF
+
47碌F
3801 TA01
*SEE NO-LOAD I
Q
vs INPUT VOLTAGE ON THE LAST PAGE OF THIS DATA SHEET
3801f
U
3801 TA02
U
U
1

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