SS6896 Datasheet, PDF (1/12 Pages) Silicon Standard Corp. – 1.4MHz Current-Mode Step-Up DC/DC Converter

SS6896
1.4MHz Current-Mode Step-Up DC/DC Converter
Features
l Fixed-frequency 1.4MHz Current-Mode PWM
operation.
l Adjustable output voltage up to 30V.
l Guaranteed 13V/ 200mA output with 5V Input.
l Input Range 2.5V to 10V.
l Maximum 0.1µA shutdown current.
l Programmable soft-start.
l Works with tiny inductors and capacitors
l Space-s aving SOT-23-6 package.
Applications
l White LED Backlight.
l OLED Driver.
Description
The SS6896 is a current-mode pulse-width
modulation (PWM), step-up DC/DC converter. The
built-in high-voltage N-channel MOSFET allows the
SS6896 to support applications with up to 30V output
voltage, as well as Single-Ended Primary Inductance
Converters (SEPIC) and other low-side switching
DC/DC converters.
The high switching frequency (1.4MHz) permits the
use of small external components. The soft -start
function is programmable with an external capacitor,
which sets the input current ramp rate.
The SS6896 is available in a space-saving SOT-23-6
package.
Typical Application Circuits
V IN
3.3V or
4.2V C1
4.7µF
OFF ON
L
D1
CH521S -30
SS6896
ZD1
BZV55 -B12
11.8V~12.2V
6 _IN
1
LX
4 _{SHDN FB} 3
SS GND
5
2
R2
1K Ω
C2
0.033µ F
C3
1µF
I_LED
R1
86
84
82
80
78
V_IN=4.2V
76
V_IN=3.3V
74
72
L: GTSK-51-150M (15µH)
70
L: GTSK-51-100M (10µH)
68
2 4 6 8 10 12 14 16 18 20
LED Current (mA)
Fig. 1 Li-Ion Powered Driver for three white LEDs
V_IN
3.6V or
4.2V C1
4.7µF
OFF ON
L
D1
CH521S-30
SS6896
ZD1
BZV55 -B24
23.5V~24.5V
6
IN
1
LX
4 _{SHDN FB} 3
SS GND
5
2
R2
1KΩ
C2
0.033µF
C3
1µF
I_LED
R1
80
78
76
74
72
70
V_IN=4.2V
68
V_IN=3.6V
66
64
L: GTSK-51-150M (15µH)
62
L: GTSK-51-100M (10µH)
60
2 4 6 8 10 12 14 16 18 20
LED Current (mA)
Fig. 2 Li-Ion Powered Driver for six white LEDs
Rev.2.01 6/06/2003
www.SiliconStandard.com
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