GM7109
150KHz, 2A STEP DOWN VOLTAGE
SWITCHING REGULATORS
Electrical Characteristics: All Output Voltage Versions
(Specifications with standard type face are for T
J
= 25℃, and those with bold face type apply over full Operating Temperature
rage. Unless otherwise specified, V
IN
= 12V)
Parameter
Feedback Bias
Current
Oscillator
Frequency
Saturation
Voltage
Max Duty Cycle
(ON)
Min Duty Cycle
(OFF)
Current Limit
Output Leakage
Current
Quiescent
Current
Standby
Quiescent
Current
SD Pin
Logic
lnput Level
SD Pin lnput
Current
Condition
V
FB
=1.3V (Adjustable Version Only)
Symbol
I
b
Min
-
127
110
Typ
10
Max
50
100
173
173
Unit
nA
(Note 6)
f
o
150
kHz
I
OUT
= 2A (Notes 7, 8)
(Note 8)
(Note 9)
Peak Current (Notes 7, 8)
Output =0V (Notes 7, 9, 10)
Output = -0.9V (Note 10)
(Note 9)
SD Pin = 5V (OFF), Note 10
Low (ON)
High (OFF)
V
LOGlC
= 2.5V (OFF)
V
LOGlC
= 0.5V (ON)
V
SAT
DC
DC
l
CL
l
L
l
Q
l
STBY
V
IH
V
IL
I
H
I
L
-
1.16
100
0
1.4
1.5
-
V
%
%
A
3.4
-
-
-
-
-
2.0
-
2
5
70
1.3
1.3
5
0.02
100
-
-
200
0.6
-
15
5
µA
mA
mA
µA
V
µA
µA
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating
Ratings indicate conditions for which the device is intended to be functional, but do not
guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical
Characteristics.
Note 2:
The human body model is a 100pF capacitor discharged through a 1.5KΩresistor into each pin.
Note 3:
Typical numbers are at 25°C and represent the most likely norm.
Note 4:
All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type
face). All room temperature limits are 100% production tested. All limits at temperature extremes are
guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to
calculate Average Outgoing Quality Level (AOQL).
Note 5:
External components such as the catch diode, inductor, input and output capacitors, and voltage
programming resistors can affect switching regulator system performance. When the GM7109 is used as
shown in the Figure 1 test circuit, system performance will be as shown in system parameters section of
Electrical Characteristics.
Note 6:
The switching frequency is reduced when the second stage current limit is activated.
Note 7:
No diode, inductor or capacitor connected to output pin.
Note 8:
Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Note 9:
Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version.
GM7109
V1.00
5
GAMMA [ GAMMA MICROELECTRONICS INC. ]
