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Numéro de référence AIC1634
Description 1.4MHz Current-Mode Step-Up DC/DC Converter
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AIC1634 Datasheet, Description
AIC1634
1.4MHz Current-Mode Step-Up DC/DC Converter
FEATURES
Fixed Frequency 1.4MHz Current-Mode PWM
Operation.
Adjustable Output Voltage up to 30V.
Guaranteed 12V/ 150mA Output with 5V Input.
2.6V to 10V Input Range.
Maximum 0.1µA Shutdown Current.
Programmable Soft-Start.
Tiny Inductor and Capacitors are allowed.
Space-Saving SOT-23-6 Package.
APPLICATIONS
LCD Bias
LCM
OLED Driver
DESCRIPTION
AIC1634 is a current-mode pulse-width modulation
(PWM), step-up DC/DC Converter. The built-in high
voltage N-channel MOSFET allows AIC1634 for
step-up applications with up to 30V output voltage,
as well as for Single Ended Primary Inductance
Converter (SEPIC) and other low-side switching
DC/DC converter.
The high switching frequency (1.4MHz) allows the
use of small external components. The Soft-Start
function is programmable with an external capacitor,
which sets the input current ramp rate.
The AIC1634 is available in a space-saving
SOT-23-6 package.
TYPICAL APPLICATION CIRCUIT
3.3~4.2V
CIN
4.7µF
L1
10µH
IN SW
SHDN FB
GND SS
AIC1634
D1
VOUT =12V
R1
105k
COUT
C1 10µF
39pF
Css
33nF
R2
12k
L1: SLF6025-100M1R0, TDK
D1: SS0540, PAN JIT
CIN: EDK316BJ475KD, Taiyo Yuden
COUT: TMK316C106KL, Taiyo Yuden
Fig. 1 12V LCD Bias Application for Li-Ion Battery
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510 www.analog.com.tw
DS-1634P-02 010405
1
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AIC1634 Fiche technique
AIC1634
ELECTRICAL CHARACTERISTICS
(VIN=V SHDN =3V, SS=Open, TA=25°C, unless otherwise specified) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Supply Range
Output Voltage Adjust Range
VIN Undervoltage Lockout
Quiescent Current
Shutdown Supply Current
ERROR AMPLIFIER
VIN
VOUT
UVLO VIN rising, 50mV hysteresis
IIN VFB = 1.3V, not switching
VFB = 1.0V, switching
V SHDN = 0V
2.6 10 V
30 V
2.2 V
0.1 0.2
mA
15
0.01 0.5 µA
Feedback Voltage
FB Input Bias Current
Feedback-Voltage Line
Regulation
OSCILLATOR
VFB
IFB VFB = 1.24V
2.6V < VIN < 5.5V
1.205 1.23 1.255
21 80
V
nA
0.05 0.50 %/V
Frequency
Maximum Duty Cycle
fOSC
DC
1 1.4 1.8 MHz
85 90
%
POWER SWITCH
On-Resistance
Leakage Current
Switch Current Limit
SOFT-START
RDS(ON) VIN = 5V
ILX(OFF) VLX = 30V
IIL
1 1.4
0.1 1 µA
400 500 650 mA
Reset Switch Resistance
Charge Current
CONTROL INPUT
Guaranteed By Design
VSS = 1.2V
100
1.5 4 7.0 µA
Input Low Voltage
Input High Voltage
SHDN Input Current
VIL V SHDN , VIN = 2.5V to 10V
VIH V SHDN , VIN = 2.5V to 10V
V SHDN = 3V
I SHDN
V SHDN = 0V
0.3
1.0
25 50
0.01 0.1
V
V
µA
Note 1: Specifications are production tested at TA=25°C. Specifications over the -40°C to 85°C operating
temperature range are assured by design, characterization and correlation with Statistical Quality
Controls (SQC).
3
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AIC1634 pdf
AIC1634
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
VSHDN
VOUT
IINDUCTOR
VIN=3.6V, VOUT=12V,
IOUT=100mA, CSS=33nF
VSHDN
VOUT
IINDUCTOR
VIN=3.6V, VOUT=12V,
IOUT=100mA, CSS=100nF
Fig. 14 Start-Up from Shutdown
VOUT
IOUT
Fig. 15 Start-Up from Shutdown
VOUT
IOUT
Fig. 16 Load Step Response
VIN=3.3V, VOUT=5V, ILOAD=5mA to 200mA
Fig. 17 Load Step Response
VIN=5V, VOUT=12V, ILOAD=50mA to 150mA
6
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