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LTC1772BES6 Datasheet

  • LTC1772BES6

  • Constant Frequency Current Mode Step-Down DC/DC Controller i...

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LTC1772B
Constant Frequency
Current Mode Step-Down
DC/DC Controller in SOT-23
FEATURES
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
Burst Mode
TM
Operation Disabled for Lower Output
Ripple at Light Loads
High Efficiency: Up to 94%
High Output Currents Easily Achieved
Wide V
IN
Range: 2.5V to 9.8V
Constant Frequency 550kHz Operation
Low Dropout: 100% Duty Cycle
Output Voltage down to 0.8V
Current Mode Operation for Excellent Line and Load
Transient Response
Shutdown Mode Draws Only 8碌A(chǔ) Supply Current
Tiny 6-Lead SOT-23 Package
The LTC
廬
1772B is a constant frequency current mode
step-down DC/DC controller providing excellent AC and
DC load and line regulation. The device incorporates an
accurate undervoltage lockout feature that shuts down the
LTC1772B when the input voltage falls below 2.0V.
The LTC1772B provides a
鹵2.5%
output voltage accuracy
and consumes only 270碌A(chǔ) of quiescent current. In shut-
down, the device draws a mere 8碌A(chǔ).
To further 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 LTC1772B is available in a small footprint 6-lead
SOT-23.
For a Burst Mode operation enabled version of the
LTC1772B, please refer to the LTC1772 data sheet.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
One or Two Lithium-Ion-Powered Applications
Cellular Telephones
Wireless Devices
Portable Computers
Distributed 3.3V, 2.5V or 1.8V Power Systems
TYPICAL APPLICATION
100
C1
10碌F
10V
V
IN
2.5V
TO 9.8V
EFFICIENCY (%)
R1
0.03鈩?/div>
1
10k
220pF
I
TH
/RUN PGATE
LTC1772B
2
3
GND
V
FB
V
IN
SENSE
鈥?/div>
5
4
D1
6
L1
M1 4.7碌H
+
C2A
47碌F
6V
C2B
1碌F
10V
V
OUT
2.5V
2A
174k
C1: TAIYO YUDEN LMK325BJ106K-T
C2A: SANYO 6TPA47M
C2B: AVX 0805ZC105KAT1A
D1: MOTOROLA MBRM120T3
L1: MURATA LQN6C-4R7
M1: FAIRCHILD FDC638P
R1: IRC LRC-LR1206-01-R030F
80.6k
1772 F01a
Figure 1. High Efficiency, High Output Current 2.5V/2A Regulator
U
Efficiency vs Load Current*
95
90
85
80
75
70
65
60
V
IN
= 3.6V
V
OUT
= 2.5V
LTC1772B
NON-BURST MODE
OPERATION
LTC1772
BURST MODE
OPERATION
10
100
1000
10000
LOAD CURRENT (mA)
*OUTPUT RIPPLE WAVEFORMS FOR THE CIRCUIT
OF FIGURE 1 APPEAR IN FIGURE 2.
1772 F01b
U
U
1

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