AIC AIC1628CS, AIC1628 Datasheet
AIC1628
µ
µ
3-Cell, High-Efficiency, Step-Up DC/DC Converter
FEATURES
4V to 24V Input Voltage Operation.
Adjustable Output Voltage.
Low Quiescent Current at 100µA.
Pulse-Skipping and Pulse-Frequency Modulation
Maintain High Efficiency (max. 95%).
90KHz to 250KHz Oscillator Frequency.
Power-Saving Shutdown Mode (8µA Typical).
Push-Pull Driver Output.
APPLICATIONS
Flash Memory Programming Power Supply.
Positive LCD Contrast Bias for Notebook &
Palmtop Computers.
Step-Up DC/DC Converter Module.
Telecom Power Supply.
DESCRIPTION
The AIC1628 is a high performance step-up
DC/DC converter, designed to drive an external
power switch to generate programmable positive voltages. In the particularly suitable LCD
contrast bias and flash memory programming
power supply applications, typical full-load efficiencies are 85% to 95%. 4V to 24V input operation range allows the AIC1628 to be powered
directly by the battery pack in the most batteryoperated applications for greater efficiency.
Output voltage can be scaled to 40V or greater
by two external resistors. A Pulse-Frequency
Modulation scheme is employed to maintain
high efficiency conversion under wide input
voltage range. Quiescent current is about
100µA and can be reduced to 8µA in shutdown
mode. Switching frequency being around 90KHz
to 250KHz range, small size switching components are ideal for battery powered portable
equipments, like notebook and palmtop computers.
TYPICAL APPLICATION CIRCUIT
5V
F
0.047
C2
VIN
VREF
SHDN
FB
R2
16.5K
AIC1628
0.033µF
DHI
DLOW
GND
C3
CL
R1
470K
0.01
*Fuse
60m
**L1
68µH
Q1
2SK940
F
C4
Ω
1N5819
D1
C5
220µF
*Buss Fuse MCR-2A
**Sumida CDR105
+
+
+5V ~ 24V
C1
120µF
C6
0.1µF
V
IN
+36V
>50mA
95
VIN=13V
=9V
V
90
=5V
V
OUT
85
Efficiency (%)
80
0 50 100 150 200
V
IN
Load Current (mA)
IN
V
OUT
VIN=18V
=36V
Color LCD Contrast Bias Supply Efficiency vs. Output Current
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC www.analog.com.tw
DS-1628-00 TEL: 886-3-5772500 FAX: 886-3-5772510
1
AIC1628
ORDERING INFORMATION
AIC1628 XX
ORDER NUMBER
PIN CONFIGURATION
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
TEMPERATURE RANGE
C=0°C~+70°C
ABSOLUTE MAXIMUM RATINGS
VIN Supply Voltage (VIN Pin) ...........................…………….............................................. 24V
Pin Voltage .........................................……………................................................15V
SHDN
Operating Temperature Range
Storage Temperature Range
TEST CIRCUIT
Refer to Typical Application Circuit
ELECTRICAL CHARACTERISTICS
.........................…………....................................... 0°C~70°C
..........................………….................................. -65°C~ 150°C
AIC1628CN
(PLASTIC DIP
AIC1628CS
(PLASTIC SO)
(VIN= 13V, Ta=25°°°°C, unless otherwise
)
TOP VIEW
VIN
VREF
SHDN
FB
specified.)
CL
1
2
3
4
8
7
6
5
DHI
DLOW
GND
PARAMETERS TEST CONDITIONS MIN. TYP. MAX. UNIT
Input Voltage 4 24 V
Quiescent Current VFB = 1.5V 100 200
Shutdown Mode Current V
V
Voltage
REF
V
Source Current 250
REF
DLOW “ON Resistance” 15
DHI “ON Resistance” 10
CL Threshold VIN - V
Shutdown Threshold 0.8 1.5 2.4 V
Shutdown Input Leakage
Current
I
V
= 0V 8 20
SHDN
= 250µA
SOURCE
CL
< 15V 1
SHDN
1.16 1.22 1.28 V
45 60 75 mV
µA
µA
µA
µA
Ω
Ω
2
AIC1628
)
TYPICAL PERFORMANCE CHARACTERISTICS
Frequency vs V
280
Ta= 0°C
Voltage
IN
Duty Cycle vs VIN Voltage
100
Ta= 25°C
90
230
180
Frequency (KHz)
130
80
4 9 14 19 24
V
(V)
IN
Quiescent Current vs V
110
Ta= 70°C
Voltage
IN
Ta= 25°C
100
Ta= 0°C
90
80
70
Quiescent Current (µA)
60
49141924
V
IN
Ta= 70°C
(V
80
70
60
Duty Cycle (%)
50
40
30
4 9 14 19 24
Ta= 0°C
V
(V)
IN
Ta= 25°C
Ta= 70°C
Current Limit Threshold vs Temperature
75
70
65
VIN = 5V
VIN = 20V
60
CL Threshold (mV)
55
50
0 20406080
VIN = 13V
Temperature (°C)
1.3
Reference Voltage vs Temperature
VIN = 5V
1.25
1.2
1.15
Reference Voltage (V)
1.1
0 20406080
Temperature (°C)
3
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