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PDF GM7110 Data sheet ( Hoja de datos )
| Número de pieza | GM7110 | |
| Descripción | 1A STEP-DOWN VOLTAGE SWITCHING REGULATOR | |
| Fabricantes | ETC | |
| Logotipo |  |
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AA
MICROELECTRONICS
Power Management
GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
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.
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
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
Feedback
7V - 40V
Unregulated
DC Input
+VIN
1
GM7110-5.0
4
Output
CIN +
2
100 µF
3 GND ON / OFF 5
L1
330 µH
D1
1N5819
+
COUT
330 µF
5.0V, 1A
Regulated
Output
www.gammamicro.com 1
PRELIMINARY
1 page  
Power Management
AA
MICROELECTRONICS
GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
ELECTRICAL CHARACTERISTICS: All Output Voltage Versions
(Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise
specified, VIN= 12V for the 3.3V, 5.0V and ADJ version, VIN= 25V for 12V version. and VIN= 30V for 15V version. ILOAD = 500 mA)
Parameter
Conditions
Symbol Min
Typ
Max Unit
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Max Duty Cycle (ON)
Current Limit
VOUT = 5V (Adjustable Version Only)
(Note 11)
IOUT = 1A (Notes 4)
(Note 5)
(Note 4, 11)
Output Leakage Current
(Notes 6, 7) Output = 0 V
Output = -1V
Quiescent Current
(Note 6)
Standby Quiescent Current
ON/OFF Pin = 5V (OFF)
Thermal Resistance
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)
ON/OFF Pin
VOUT=0V
Logic Input Level
VOUT = Nominal Output Voltage
ON/OFF Pin Input Current
ON/OFF Pin = 5V (OFF)
ON/OFF Pin = 0V (ON)
IFB - 50 100 / 500 nA
FO 47 / 42 52 58 / 63 kHz
VSAT
-
0.9 1.2 / 1.4
V
TDC 93 98
-
%
ICL
1.7 / 1.3
2.2
3.0 / 3.2
A
IOL
-
-
-
7.5
2
30
mA
IQ - 5 10 mA
ISTBY
qJA
qJA
qJC
qJC
qJA
VIH
-
-
-
-
-
-
2.2 / 2.4
50
65
45
2
6
37
1.4
200 mA
-
-
- °C/W
-
-V
VIL
-
1.2 1.0 / 0.8
V
VIH - 12 30 mA
IIL - 0 10 mA
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: VIN = 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, qJA is 50°C//W, with 1 square inch
of copper area, qJA is 37°C/W, and with 1.6 or more square inches of copper area, qJA 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%.
5
5 Page 
AA
MICROELECTRONICS
Power Management
GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
ORDERING NUMBER
GM 7110 A TB5 T
Gamma Micro.
Circuit Type
Output Voltage
A: Adj, 3.3: 3.3V
5.0: 5.0V, 12: 12V
15: 15V
Shipping
R: Tape & Reel
T: Tube
Package
TA5: TO-263-5
TB5: TO-220-5
TC5: TO-252-5
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet GM7110.PDF ] | |
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