CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests
are at the specified temperature and are pulsed tests, therefore: T
J
= T
C
= T
A
Electrical Specifications
PARAMETER
IQ1
IQ2
VFB
IB
V
IN
D
MAX
I
LIM
I
SHDN
V
LBI
V
OL-LBO
I
LEAK-LBO
R
DS-ON
I
LEAK-SWITCH
V
OUT
/V
IN
V
OUT
/I
OUT
F
OSC-MAX
F
OSC1
VHI_EN
VLO_EN
V
IN
= 5V, V
OUT
= 12V, I
OUT
= 0mA, R
T
= 100k, T
A
= 25°C unless otherwise specified.
CONDITION
VEN = 0
VEN = 2V
1.31
2.5
1.35
MIN
TYP
MAX
3
4
1.39
0.10
2
84
1000
90
1250
1500
1
180
ILBO = 1mA
VLBI = 250mV, VLBO = 5V
at 12V output
220
0.1
0.02
300
1
3V < V
IN
< 6V, V
OUT
= 12V, no load
I
OUT
< 250mA
R
T
= 49.9k
530
1.6
0.5
0.5
1200
670
800
0.15
250
0.2
1
UNIT
µA
mA
V
µA
V
%
mA
µA
mV
V
µA
m
µA
%/V
%
kHz
kHz
V
V
DESCRIPTION
Quiescent Current - Shut-down
Quiensent Current
Feedback Voltage
Feedback Input Bias Current
Input Voltage Range
Maximum Duty Cycle
Current Limit - Max Average Input
Current
Shut-down Input Bias Current
LBI Threshold Voltage
LBO Output Low
LBO Output Leakage Current
Switch On Resistance
Switch Leakage Current
Line Regulation
Load Regulation
Maximum Switching Frequency
Switching Frequency
EN Input High Threshold
EN Input Low Threshold
Pin Descriptions
PIN NUMBER
1
2
3
4
5
6
7
8
9
10
PIN NAME
PGND
SGND
RT
EN
LBI
LBO
SS
FB
VDD
LX
PIN FUNCTION
Power ground; connected to the source of internal N-channel power MOSFET
Signal ground; ground reference for all the control circuitry; needs to have only a single connection to PGND
Timing resistor to adjust the oscillation frequency of the converter
Chip enable; connects to logic HI (>1.6V) for chip to function
Low battery input; connects to a sensing voltage, or left open if function is not used
Low battery detection output; connected to the open drain of a MOSFET; able to sink 1mA current
Soft-start; connects to a capacitor to control the start-up of the converter
Voltage feedback input; needs to connect to resistor divider to decide V
O
Control circuit positive supply
Inductor drive pin; connected to the drain of internal N-channel power MOSFET
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