LTC1626 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1626' PDF : 12 Pages View PDF
LTC1626
APPLICATIONS INFORMATION
3. Is the input decoupling capacitor (0.1µF) connected
closely between power VIN (Pins 1, 13) and power
ground (Pin 12)? This capacitor carries the high fre-
quency peak currents.
4. Is the Schottky diode closely connected between the
power ground (Pin 12) and switch output (Pin 14)?
5. Does the LTC1626 SENSE– (Pin 7) connect to a point
close to RSENSE and the (+) plate of COUT? The resistor
divider R1-R2 must be connected between the (+) plate
of COUT and the signal ground.
6. Are the SENSE – and SENSE+ leads routed together with
minimum PC trace spacing? The 1000pF capacitor
between Pin 7 and Pin 8 should be as close as possible
to the LTC1626.
7. Is SHDN (Pin 10) actively pulled to ground during
normal operation? The shutdown pin is high imped-
ance and must not be allowed to float.
TYPICAL APPLICATIONS
Single Cell Li-Ion to 2.5V Converter
(VIN = 2.7V TO 4.5V)
SINGLE +
Li-ION
CELL
PWR VIN
LBI
LBO
VIN
SW
SHUTDOWN
1k
3900pF
CT
270pF
SHDN
PGND
LTC1626
ITH
SENSE +
SENSE –
CT
VFB
SGND
+
0.1µF
CIN†
47µF
16V
L1*
22µH
RSENSE**
0.1Ω
D1
MBR0520LT1
1000pF
100pF
* SUMIDA CDRH62-220
** IRC 1206-R100F
† AVX TPSD476K016
†† AVX TPSD107K010
3- to 4-Cell NiCd/NiMH to 2.5V Converter
VOUT
2.5V
0.25A
+
10k
COUT††
100µF
10V
10k
1626 TA01
3- OR 4-CELL
NiCd OR NiMH
(VIN = 2.7V TO 6V)
+
R4
PWR VIN
VIN
LBI
SW
R3
LBO
SHUTDOWN
1k
3900pF
CT
270pF
SHDN
PGND
LTC1626
ITH
SENSE+
SENSE –
CT
VFB
SGND
+
0.1µF
CIN†
47µF
16V
L1*
22µH
RSENSE**
0.1Ω
D1
MBR0520LT1
1000pF
100pF
* SUMIDA CDRH62-220
** IRC 1206-R100F
† AVX TPSD476K016
†† AVX TPSD107K010
††† FOR 3.3V:
R1 = 15k, 1%
R2 = 9.09k, 1%
VOUT
2.5V
0.25A
+
R1†††
10k
R2†††
10k
COUT††
100µF
10V
1626 TA02
10
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