LTC1626
Low Voltage, High Efficiency
Step-Down DC/DC Converter
FEATURES
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DESCRIPTION
The LTC
廬
1626 is a monolithic, low voltage, step-down
current mode DC/DC converter featuring Burst Mode
TM
operation at low output current.
The input supply voltage range of 2.5V to 6V makes the
LTC1626 ideal for single cell Li-Ion and 3- or 4-cell NiCd/
NiMH applications. A built-in 0.32鈩?switch (V
IN
= 4.5V)
allows up to 0.6A of output current.
The LTC1626 incorporates automatic power saving Burst
Mode operation to reduce gate charge losses when the
load current drops below the level required for continuous
operation. With no load, the converter draws only 165碌A(chǔ).
In shutdown, it draws a mere 0.5碌A(chǔ)鈥攎aking it ideal for
current sensitive applications.
The inductor current is user-programmable via an external
current sense resistor. In dropout, the internal P-channel
MOSFET switch is turned on continuously, maximizing
battery life.
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Wide Input Supply Voltage Range: 2.5V to 6V
High Efficiency: Up to 95%
Low R
DS(ON)
Internal Switch: 0.32
鈩?/div>
(V
IN
= 4.5V)
Current Mode Operation for Excellent Line and Load
Transient Response
Short-Circuit Protected
Low Dropout Operation: 100% Duty Cycle
Built-In Low-Battery Detector
Low Quiescent Current at Light Loads: I
Q
= 165碌A(chǔ)
Ultralow Shutdown Current: I
Q
= 0.5碌A(chǔ)
Peak Inductor Current Independent of Inductor Value
Available in 14-Pin SO Package
APPLICATIONS
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Single Cell Li-Ion Step-Down Converters
3- or 4-Cell NiMH Step-Down Converters
Cellular Telephones
5V to 3.3V Conversion
3.3V to 2.5V Conversion
Inverting Converters
Portable Instruments
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
V
IN
2.7V TO 6V
+
C
IN鈥?/div>
47碌F
16V
0.1碌F
PWR V
IN
SHDN
LTC1626
V
IN
SW
PGND
470鈩?/div>
I
TH
C
T
SENSE
+
SENSE
鈥?/div>
SGND
V
FB
100pF
10k
1626 F01
100
L*
33碌H
D1
MBRS130LT
R
SENSE
**
0.1鈩?/div>
V
OUT
2.5V
0.25A
95
3900pF
+
C
OUT鈥犫€?/div>
100碌F
6.3V
EFFICIENCY (%)
90
85
80
75
70
0.01
1000pF
10k
C
T
270pF
* COILTRONICS CTX33-4
** IRC 1206-R100F
鈥?/div>
AVX TPSD476KO16
鈥犫€?/div>
AVX TPSC107M006R0150
Figure 1. High Efficiency 2.5V Step-Down Converter
U
U
U
Efficiency
V
IN
= 3.5V
L1 = 33碌H
V
OUT
= 2.5V
R
SENSE
= 0.1鈩?/div>
C
T
= 270pF
0.1
OUTPUT CURRENT (A)
1
1626 F01a
1
LTC1626相關(guān)型號(hào)PDF文件下載
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