3
FN7120.2
August 10, 2007
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ 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
Absolute Maximum Ratings (T
A
= +25°C) Thermal Information
EN, LBI, V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+12V
LX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+18V
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Operating Junction Temperature: . . . . . . . . . . . . . . . . . . . . . +135°C
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
Electrical Specifications V
IN
= 5V, V
OUT
= 12V, L = 10µH, I
OUT
= 0mA, R
T
= 100k, T
A
= +25°C, Unless Otherwise Specified.
PARAMETER DESCRIPTION CONDITIONS
MIN
(Note 1) TYP
MAX
(Note 1) UNIT
V
IN
Input Voltage Range 1.8 13.2 V
V
OUT
Output Voltage Range 4.5 17 V
IQ1 Quiescent Current - Shut-down V
EN
= 0, feedback resistors disconnected 1 µA
IQ2 Quiescent Current V
EN
= 2V 1.4 2 mA
V
FB
Feedback Voltage 1.29 1.33 1.37 V
IB Feedback Input Bias Current 0.10 µA
D
MAX
Maximum Duty Cycle 84 90 %
I
LIM
Current Limit - Max Peak Input
Current
11.4 A
I
SHDN
Shut-down Input Bias Current 1µA
V
LBI
LBI Threshold Voltage 180 220 250 mV
V
OL-LBO
LBO Output Low I
LBO
= 1mA 0.1 0.2 V
I
LEAK-LBO
LBO Output Leakage Current V
LBI
= 250mV, V
LBO
= 5V 0.02 2 µA
r
DS(ON)
Switch On Resistance at 12V output 220 m
I
LEAK-SWITCH
Switch Leakage Current 1µA
V
OUT
/V
IN
/V
OUT
Line Regulation 3V < V
IN
< 6V, V
OUT
= 12V, no load 0.4 %/V
V
OUT
/V
OUT
Load Regulation I
OUT
= 50mA to 150mA 1 %
f
OSC-MAX
Maximum Switching Frequency R
T
= 49.9k 1200 kHz
f
OSC1
Switching Frequency 600 670 750 kHz
VHI_EN EN Input High Threshold 1.6 V
VLO_EN EN Input Low Threshold 0.5 V
Pin Descriptions
PIN NUMBER PIN NAME PIN FUNCTION
1 PGND Power ground; connected to the source of internal N-Channel power MOSFET
2 SGND Signal ground; ground reference for all the control circuitry; needs to have only a single connection to PGND
3 RT Timing resistor to adjust the oscillation frequency of the converter
4 EN Chip enable; connects to logic HI (>1.6V) for chip to function
5 LBI Low battery input; connects to a sensing voltage, or left open if function is not used
6 LBO Low battery detection output; connected to the open drain of a MOSFET; able to sink 1mA current
7 SS Soft-start; connects to a capacitor to control the start-up of the converter
8 FB Voltage feedback input; needs to connect to resistor divider to decide V
O
9 VDD Control circuit positive supply
10 LX Inductor drive pin; connected to the drain of internal N-Channel power MOSFET
EL7515
