MICROELECTRONICS
A
A
Power Management
GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
Features
3.3V, 5V, 12V, 15V and Adjustable output versions
Adjustable version output voltage range 1.23V
to 37V ±4% max over line and load conditions
1A output current
Requires Only 4 External Components
High Efficiency
TTL shutdown capability and low power standby
mode
Thermal shutdown, current limit protection
Uses standard inductors
52 kHz fixed frequency internal oscillator
Description
GM7110 of regulators provides all the active functions for a step-
down (buck) switching regulator, and drives 1A load with excellent
line and load regulation. GM7110 is available in fixed output volt-
ages of 3.3V, 5V, 12V, 15V, and a versatile Adjustable output ver-
sion. These regulators are simple to use and require a minimum
number of external components.
Features include internal frequency compensation and a fixed-
frequency oscillator. GM7110 high-efficiency replacement for popu-
lar three-terminal linear regulators, and is requiring a smaller heat
sink or even no heat sink. GM7110 performs well with standard
inductors from several manufacturers, and simplifying the design
of switch-mode power supplies. GM7110 guarantees ±4% toler-
ance on output voltage within specified input voltages and output
load conditions, and ±10% on the oscillator frequency. External
shutdown is included with 50 µA (typical) standby current. The
output switch has cycle-by-cycle current limiting as well as ther-
mal shutdown for full protection under fault conditions.
Application
Pre-regulator for linear regulators
High-efficiency step-down buck regulator
On-card/ board switching regulators
Positive to negative converter (buck-boost
)
TYPICAL APPLICATION
7V - 40V
Unregulated
DC Input
100 µF
+V
IN
1
C
IN
+
Feedback
4
GM7110-5.0
3 GND ON / OFF 5
Output
2
L1
330 µH
D1
1N5819
+
C
OUT
330 µF
5.0V, 1A
Regulated
Output
www.gammamicro.com
PRELIMINARY
GM7110
V0.1
1
GM 431
MICROELECTRONICS
A
A
Power Management
GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
MARKING INFORMATION & PIN CONFIGURATIONS
TO-220- 5
TO-220- 5B
TO-252-5 (DPAK)
TO-263-5(D PAK)
2
GM7110
VVAYWW
GM7110
VVAYWW
GM7110
VVAYWW
GM7110
VVAYWW
V
IN
Output
Ground
V
IN
Output
ON/OFF
Feedback Ground
ON/OFF
Feedback
V
IN
Output
Ground
ON/OFF
Feedback
V
IN
Output
Ground
ON/OFF
Feedback
1 2 3 4 5
ORDERING INFORMATION
Ordering Number
GM7110-ATB5T
GM7110-ATB5BT
GM7110-ATA5R
GM7110-ATA5T
GM7110-3.3TB5T
GM7110-3.3TB5BT
GM7110-3.3TA5R
GM7110-3.3TA5T
GM7110-5.0TB5T
GM7110-5.0TB5BT
GM7110-5.0TA5R
GM7110-5.0TA5T
GM7110-5.0TC5T
GM7110-5.0TC5R
GM7110-12TB5T
GM7110-12TB5BT
V V, VVV
A
Y
WW
= Output Voltage (33=3.3V , 120=12V,A=Adj)
= Assembly Location
= Year
= Weekly
Output Voltage
Adj
Adj
Adj
Adj
3.3
3.3
3.3
3.3
5.0
5.0
5.0
5.0
5.0
5.0
12
12
12
12
15
15
15
15
Package
TO-220-5
TO-220-5B
TO-263-5
TO-263-5
TO-220-5
TO-220-5B
TO-263-5
TO-263-5
TO-220-5
TO-220-5B
TO-263-5
TO-263-5
TO-252-5
TO-252-5
TO-220-5
TO-220-5B
TO-263-5
TO-263-5
TO-220-5
TO-220-5B
TO-263-5
TO-263-5
Shipping
50 Units / Tube
50 Units / Tube
800 Units/ Tape & Reel
50 Units / Tube
50 Units / Tube
50 Units / Tube
800 Units/ Tape & Reel
50 Units / Tube
50 Units / Tube
50 Units / Tube
800 Units/ Tape & Reel
50 Units / Tube
80 Units/ Tube
2,500 Units/ Tape & Reel
50 Units / Tube
50 Units / Tube
800 Units/ Tape & Reel
50 Units / Tube
50 Units / Tube
50 Units / Tube
800 Units/ Tape & Reel
50 Units / Tube
GM7110
2
GM7110-12TA5R
GM7110-12TA5T
GM7110-15TB5T
GM7110-15TB5BT
GM7110-15TA5R
GM7110-15TA5T
* TB5B: Bent and Staggered Leads of TO-220 package
** For detail Ordering Number identification, please see last page.
MICROELECTRONICS
A
A
Power Management
GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Maximum Supply Voltage
ON/OFF Pin Input Voltage
Output Voltage to Ground (Steady State)
Power Dissipation
Storage Temperature Range
Maximum Junction Temperature
Lead Temperature (Soldering, 10 sec.)
-0.3
VALUE
45
V V
IN
-1.0
Internally Limited
-65 to + 150
+150
+260
UNIT
V
V
V
-
°C
°C
°C
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Temperature Range
Supply Voltage
VALUE
-40
T
J
40
125
UNIT
°C
V
BLOCK DIAGRAM
Unregulated
DC Input
V
IN
1
4
Feed-
back
Internal
Regulator
ON/OFF
5
ON/OFF
+
C
IN
R2
+
Fixed Gain
Error AMP
Comparator
+
-
Driver
1 AMP
Switch
Output
1.0K
R1
-
L1
2
1.23V
Band-Gap
Reference
D1
52kHz
Oscillator
Reset
Thermal
Shutdown
Current
Limit
+
V
OUT
GND
V
OUT
3.3V, R2 = 1.7K
5V, R2 = 3.1K
12V, R2 = 8.84K
15V, R2 = 11.3K
For ADJ. Version
R1 = Open, R2 = 0W
GM7110
3
3
C
out
L
O
A
D
MICROELECTRONICS
A
A
Power Management
GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
ELECTRICAL CHARACTERISTICS: GM7110-3.3
(Specifications with standard type face are for T
J
= 25°C, and those with
boldface type
apply over full Operating Temperature Range)
Parameter
Output Voltage
Output Voltage
Efficiency
Conditions
V
IN
= 12V, I
LOAD
= 0.2A
4.75V V
IN
40V, 0.2A I
LOAD
1A
V
IN
= 12V, I
LOAD
= 1A
Symbol
V
OUT
V
OUT
h
Min
3.234
3.168/3.135
-
Typ
3.3
3.3
75
Max
3.366
3.432/3.465
-
Unit
V
V
%
ELECTRICAL CHARACTERISTICS: GM7110-5.0
(Specifications with standard type face are for T
J
= 25°C, and those with
boldface type
apply over full Operating Temperature Range)
Parameter
Output Voltage
Output Voltage
Efficiency
Conditions
V
IN
= 12V, I
L
OAD
= 0.2A
8V V
IN
40V, 0.2A I
LOAD
1A
V
IN
= 12V, I
LOAD
= 1A
Symbol
V
OUT
V
OUT
h
Min
4.900
4.800/4.750
-
Typ
5.0
5.0
77
Max
5.100
5.200/5.250
-
Unit
V
V
%
ELECTRICAL CHARACTERISTICS: GM7110-12
(Specifications with standard type face are for T
J
= 25°C, and those with
boldface type
apply over full Operating Temperature Range)
Parameter
Output Voltage
Output Voltage
Efficiency
Conditions
V
IN
= 25V, I
LOAD
= 0.2A
15V V
IN
40V, 0.2A I
LOAD
1A
V
IN
= 15V, I
LOAD
= 1A
Symbol
V
OUT
V
OUT
h
Min
11.76
11.52/11.40
-
Typ
12.0
12.0
88
Max
12.24
12.48/12.60
-
Unit
V
V
%
ELECTRICAL CHARACTERISTICS: GM7110-15
(Specifications with standard type face are for T
J
= 25°C, and those with
boldface type
apply over full Operating Temperature Range)
Parameter
Feedback Voltage
Feedback Voltage
Efficiency
Conditions
V
IN
= 30V, I
LOAD
= 0.2A
18V V
IN
40V, 0.2A I
LOAD
1A
V
IN
= 18V, I
LOAD
= 1A
Symbol
V
OUT
V
OUT
h
Min
14.70
14.40/14.25
-
Typ
15.0
15.0
88
Max
15.30
15.60/15.75
-
Unit
V
V
%
ELECTRICAL CHARACTERISTICS: GM7110-ADJ
GM7110
(Specifications with standard type face are for T
J
= 25°C, and those with
boldface type
apply over full Operating Temperature Range)
Parameter
Feedback Voltage
Feedback Voltage
Efficiency
Conditions
V
IN
= 12V, I
LOAD
= 0.2A, V
OUT
= 5V
8V V
IN
40V, 0.2A I
LOAD
1A
V
OUT
= 5V
V
IN
= 12V, I
LOAD
= 1.0A, V
OUT
=5V
Symbol
V
OUT
V
OUT
h
Min
1.217
1.193/1.180
-
Typ
1.230
1.230
77
Max
1.243
1.267/1.280
-
Unit
V
V
%
4
MICROELECTRONICS
A
A
Power Management
GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
ELECTRICAL CHARACTERISTICS: All Output Voltage Versions
(Specifications with standard type face are for T
J
= 25°C, and those with
boldface type
apply over full Operating Temperature Range. Unless otherwise
specified, V
IN
= 12V for the 3.3V, 5.0V and ADJ version, V
IN
= 25V for 12V version. and V
IN
= 30V for 15V version. I
LOAD
= 500 mA)
Parameter
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Max Duty Cycle (ON)
Current Limit
Output Leakage Current
Quiescent Current
Standby Quiescent Current
Conditions
V
OUT
= 5V (Adjustable Version Only)
(Note 11)
I
OUT
= 1A (Notes 4)
(Note 5)
(Note 4, 11)
(Notes 6, 7)
Output = 0 V
Output = -1V
Symbol
I
FB
F
O
V
SAT
T
DC
I
CL
I
OL
I
Q
I
STBY
q
JA
q
JA
q
JC
q
JC
q
JA
V
IH
V
IL
V
IH
I
IL
Min
-
47 /
42
-
93
1.7 /
1.3
-
-
-
-
-
-
-
-
-
2.2 /
2.4
-
-
-
Typ
50
52
0.9
98
2.2
-
7.5
5
50
65
45
2
6
37
1.4
1.2
12
0
Max
100 /
500
58 /
63
1.2 /
1.4
-
3.0 /
3.2
2
30
10
200
-
-
-
-
-
1.0 /
0.8
30
10
Unit
nA
kHz
V
%
A
mA
mA
mA
(Note 6)
ON/OFF Pin = 5V (OFF)
TO-220 Package, Junction to Ambient (Note 8)
TO-220 Package, Junction to Ambient (Note 8)
Thermal Resistance
TO-220,TO-263, Package, Junction to Case
TO-252 Package, Junction to Case
TO-263 Package, Junction to Ambient (Note 10)
°C/W
ON/OFF Pin
Logic Input Level
V
OUT
=0V
V
OUT
= Nominal Output Voltage
ON/OFF Pin = 5V (OFF)
V
V
mA
mA
ON/OFF Pin Input Current
ON/OFF Pin = 0V (ON)
GM7110
5
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indic
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.
Note 2:
All limits guaranteed at 25°C (standard type face) and over full operating temperature range (bold type face).
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.
Note 3:
External components such as the catch diode, inductor, input and output capacitors can affect switching regulator
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.
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
the 12V and 15V versions, to force the output transistor OFF.
Note 7:
V
IN
= 40V
Note 8:
Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically,
with
½
inch leads in a socket, or on a PC board with minimum copper area.
Note 9:
Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically,
with
¼
inch leads soldered to a PC board containing approximately 4 square inches of copper area surrounding
the leads.
Note 10:
If the TO-263 package is used, the thermal resistance can be reduced by increasing the PC board Copper area
thermally connected to the package. Using 0.5 square inches of copper area,
q
JA
is 50°C//W, with 1 square inch
of copper area,
q
JA
is 37°C/W, and with 1.6 or more square inches of copper area,
q
JA
is 32°C/W.
Note 11:
The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an Overload which
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%.
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