SC4501STDEVB Semtech, SC4501STDEVB Datasheet - Page 19

• Manufacturer Part Number: SC4501STDEVB
• Description: EVALUATION BOARD
• Manufacturer: Semtech

Specifications of SC4501STDEVB

• Silicon Manufacturer: Semtech
• Application Sub Type: Step Up Switching Regulator
• Kit Application Type: Power Management - Voltage Regulator
• Silicon Core Number: SC4501
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

POWER MANAGEMENT
Typical Application Circuits
2005 Semtech Corp.
Figure 14(b) and 14(c). Photo Flash LED Current is Switched Between Torch Mode (0.2A) and Flash Mode (0.7A).
CH1
CH2
CH3
CH4
2.6 - 4.2V
1-CELL
Figure 14(a). 1.4MHz Luxeon
LI-ION
4ms/div
C1
2.2 F
(b)
Higher LED Current (>0.7A) in Flash Mode is Possible with Fresh Battery.
OFF
V
ON
IN
= 2.6V
10nF
8
3
C3
CH2 : FB Pin Voltage, 1V/div
CH4 : Inductor Current, 1A/div
CH1 : Torch/Flash Control Voltage, 5V/div
CH3 : LED Current, 0.5A/div
SHDN
SS
IN
GND
6
4
SUMIDA
SC4501
2.2 H
CR43
0.7A (FLASH)
0.2A (TORCH)
L1
ROSC
7
COMP
TM
5
SW
R4
8.06K
FB
Flash White LED Driver for Camera Phones
2
1
19
C4
10nF
TORCH
0.1
R6
R5
10K
C5
0.1 F
LM358
R1
698
1/2
FLASH
- 3.4V to 3.8V +
LXCL-PWF1
CH1
CH2
CH3
CH4
D2
M1
MMBF2201NT1
R6
17.4K
Q1
MMBT3904T
R2
43.2K
10BQ015
4ms/div
D1
(c)
C2
4.7 F
V
IN
= 4.2V
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SC4501