gm7110 Gamma Microelectronics, gm7110 Datasheet - Page 5

• Manufacturer Part Number: gm7110
• Description: Gm7110 1a Step-down Voltage Switching Regulator
• Manufacturer: Gamma Microelectronics

ELECTRICAL CHARACTERISTICS: All Output Voltage Versions
(Specifications with standard type face are for T = 25°C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise
specified, V = 12V for the 3.3V, 5.0V and ADJ version, V = 25V for 12V version. and V = 30V for 15V version. I
Parameter
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Max Duty Cycle (ON)
Current Limit
Output Leakage Current
Quiescent Current
Standby Quiescent Current
Thermal Resistance
ON/OFF Pin
Logic Input Level
ON/OFF Pin Input Current
Note 11: The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an Overload which
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indic
Note 2: All limits guaranteed at 25°C (standard type face) and over full operating temperature range (bold type face).
Note 3: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator
Note 4: Output pin sourcing current. No diode, inductor or capacitor connected to output.
Note 5: Feedback pin removed from output and connected to 0V.
Note 6: Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V, and 5V versions, and +25V for
Note 7: V
Note 8: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically,
Note 9: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically,
Note 10: If the TO-263 package is used, the thermal resistance can be reduced by increasing the PC board Copper area
ate conditions for which the device is intended to be functional, but do not guarantee specific performance limits.
Guaranteed specifications and Test conditions are shown in Electrical Characteristics.
All 25°C limits are 100% production tested. All limits over full operating temperature range are guaranteed via
correlation using standard Statistics Quality Control methods.
system performance. When the GM7110 is used as shown in the Figure 2 test circuit, system performance will be
as shown in system parameters section of Electrical Characteristics.
the 12V and 15V versions, to force the output transistor OFF.
with ½ inch leads in a socket, or on a PC board with minimum copper area.
with ¼ inch leads soldered to a PC board containing approximately 4 square inches of copper area surrounding
the leads.
MICROELECTRONICS
IN
causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self-
protection feature lowers the Average power dissipation of Gm7110 By lowering the minimum duty cycle from
5% down to approximately 2%.
of copper area, q
IN
thermally connected to the package. Using 0.5 square inches of copper area, q
= 40V
A
TO-220 Package, Junction to Ambient (Note 8)
TO-220 Package, Junction to Ambient (Note 8)
TO-220,TO-263, Package, Junction to Case
TO-252 Package, Junction to Case
TO-263 Package, Junction to Ambient (Note 10)
A
JA
is 37°C/W, and with 1.6 or more square inches of copper area, q is 32°C/W.
V
OUT
V
(Notes 6, 7)
OUT
= 5V (Adjustable Version Only)
ON/OFF Pin = 5V (OFF)
ON/OFF Pin = 5V (OFF)
ON/OFF Pin = 0V (ON)
J
= Nominal Output Voltage
I
OUT
Conditions
(Note 4, 11)
= 1A (Notes 4)
(Note 11)
V
(Note 5)
(Note 6)
OUT
IN
=0V
Output = 0 V
Output = -1V
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
Power Management
Symbol
I
V
IN
T
STBY
q
q
q
q
q
I
V
V
V
I
F
I
I
I
FB
SAT
DC
CL
OL
JA
JA
JC
JC
JA
Q
IL
O
IH
IL
IH
1.7 / 1.3
2.2 / 2.4
47 / 42
Min
93
-
-
-
-
-
-
-
-
-
-
-
-
-
-
JA
LOAD
is 50°C//W, with 1 square inch
Typ
0.9
2.2
7.5
1.4
1.2
50
98
50
65
45
37
52
12
JA
= 500 mA)
5
0
-
2
6
GM7110
100 / 500
1.2 / 1.4
3.0 / 3.2
1.0 / 0.8
58 / 63
Max
200
30
10
30
10
2
-
-
-
-
-
-
Unit
°C/W
nA
kHz
mA
mA
mA
mA
mA
%
V
A
V
V
5