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MICROELECTRONICS
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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 version. 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 popular 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% tolerance on output voltage within specified input voltages and output load conditions, and 10% on the oscillator frequency. External shutdown is included with 50 uA(typical) standby current. The output switch has cycle-by-cycle current limiting as well as thermal 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
7V - 40V Unregulated DC Input 100 F
+VIN 1 CIN +
GM7110-5.0
3 GND ON / OFF 5
Output 2
L1 330 H D1 1N5819 + COUT 330 F
5.0V, 1A Regulated Output
www.gammamicro.com
GM7110 V0.1
1
Feedback 4
GM 431
MICROELECTRONICS
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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
VIN Output Ground
VIN Output ON/OFF Feedback Ground
ON/OFF Feedback
VIN Output Ground
ON/OFF Feedback
VIN Output Ground
ON/OFF Feedback
1 23 45
V V, VVV A Y WW
= Output Voltage (33=3.3V , 120=12V,A=Adj) = Assembly Location = Year = Weekly
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 GM7110-12TA5R GM7110-12TA5T
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
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.
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MICROELECTRONICS
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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 VIN -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 TJ 40 125
UNIT
C V
BLOCK DIAGRAM
Unregulated DC Input
V IN
1 4
Feedback
Internal Regulator
ON/OFF
5
ON/OFF
+
CIN
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
+
VOUT
3
GND
C out
L O A D
VOUT 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
MICROELECTRONICS
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Power Management GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
ELECTRICAL CHARACTERISTICS: GM7110-3.3
(Specifications with standard type face are for TJ = 25C, and those with boldface type apply over full Operating Temperature Range)
Parameter
Output Voltage Output Voltage Efficiency
Conditions
VIN = 12V, ILOAD = 0.2A 4.75V VIN 40V, 0.2A ILOAD 1A VIN = 12V, ILOAD = 1A
Symbol
VOUT VOUT 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 TJ = 25C, and those with boldface type apply over full Operating Temperature Range)
Parameter
Output Voltage Output Voltage Efficiency
Conditions
VIN = 12V, ILOAD = 0.2A 8V VIN 40V, 0.2A ILOAD 1A VIN = 12V, ILOAD = 1A
Symbol
VOUT VOUT 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 TJ = 25C, and those with boldface type apply over full Operating Temperature Range)
Parameter
Output Voltage Output Voltage Efficiency
Conditions
VIN = 25V, ILOAD = 0.2A 15V VIN 40V, 0.2A ILOAD 1A VIN = 15V, ILOAD = 1A
Symbol
VOUT VOUT 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 TJ = 25C, and those with boldface type apply over full Operating Temperature Range)
Parameter
Feedback Voltage Feedback Voltage Efficiency
Conditions
VIN = 30V, ILOAD = 0.2A 18V VIN 40V, 0.2A ILOAD 1A VIN = 18V, ILOAD = 1A
Symbol
VOUT VOUT 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
(Specifications with standard type face are for TJ = 25C, and those with boldface type apply over full Operating Temperature Range)
Parameter
Conditions
VIN = 12V, ILOAD = 0.2A, VOUT = 5V 8V VIN 40V, 0.2A ILOAD 1A VOUT = 5V VIN = 12V, ILOAD = 1.0A, VOUT=5V
Symbol
VOUT VOUT h
Min
1.217 1.193/1.180 -
Typ
1.230 1.230 77
Max
1.243 1.267/1.280 -
Unit
V V %
GM7110
4
Feedback Voltage Feedback Voltage Efficiency
MICROELECTRONICS
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Power Management GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
ELECTRICAL CHARACTERISTICS: All Output Voltage Versions
(Specifications with standard type face are for TJ = 25C, 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
Feedback Bias Current Oscillator Frequency Saturation Voltage Max Duty Cycle (ON) Current Limit Output Leakage Current Quiescent Current Standby Quiescent Current
Conditions
VOUT = 5V (Adjustable Version Only) (Note 11) IOUT = 1A (Notes 4) (Note 5) (Note 4, 11) (Notes 6, 7) Output = 0 V Output = -1V
Symbol
IFB FO VSAT TDC ICL IOL IQ ISTBY qJA qJA qJC qJC qJA VIH VIL VIH IIL
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
VOUT=0V VOUT = 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 25C (standard type face) and over full operating temperature range (bold type face). All 25C 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 1/2 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 1/4 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 50C//W, with 1 square inch of copper area, qJA is 37C/W, and with 1.6 or more square inches of copper area, qJA is 32C/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 selfprotection feature lowers the Average power dissipation of Gm7110 By lowering the minimum duty cycle from 5% down to approximately 2%.
MICROELECTRONICS
A
A
Power Management GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
TEST CIRCUIT AND LAYOUT GUIDELINES
Careful layout is important with any switching regulator. Rapidly switching currents associated with wiring inductance generate voltage transients, which can cause problems. To minimize inductance and ground loops, the lengths of the leads indicated by heavy lines in Figure 1 below should be kept as short as possible. Singlepoint grounding (as indicated in Figure 1) or ground plane construction should be used for best results. When using the Adjustable version, place the programming resistors as close as possible to GM7110, to keep the sensitive feedback wiring short.
Figure 1(a). Fixed Output Voltage Versions
+VIN 1
GM 7110 FIXED OUTPUT
ON/OFF 5
Feedback 4 Output 2 L1 330 H + L O A D VOUT
GND 3 VIN Unregulated DC Input + CIN 100 F
D1 MBR360
COUT 330 F
CIN - 100 F, 75V, Aluminum Electrolytic COUT - 330 F, 25V, Aluminum Electrolytic D1 - Schottky, MBR360 L1 - 330 H, 3L Electronic Corp. TC-331M-1.0A- 5026 R1 - 2k, 0.1%
GM7110
R2 - 6.12k, 0.1%
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MICROELECTRONICS
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Power Management GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
Figure 1(b).Adjustable Output Voltage Versions
Feedback +VIN 1 7V - 40V Unregulated DC Input GND 3 + CIN 100 F ON/ OFF 5 D1 MBR360 + COUT 330 F 4
GM7110-ADJ
Output 2 L1 330 H R2 L O A D VOUT=5.0V
R1
VOUT = VREF ( 1 +
VOUT R2 = R1 ( V -1) REF
R2 ) R1
where VREF = 1.23V, R1 between 1k and 5k.
Typical Performance Characteristics
Figure 2. Switch Saturation Voltage
1.2
INPUT-OUTPUT DIFFERENTIAL (V) SATURATION VOLTAGE (V) 2.0 DVOUT = 5% RIND = 0.2W 1.5 ILOAD = 1A
Figure 3. Dropout Voltage
1.0
TJ = - 55C
TJ = - 25C 0.8 TJ = 150C 0.6
1.0 ILOAD = 200mA 0.5
0.4 0 0.2 0.4 0.6 0.8 1.0
SWITCH CURRENT (A)
0 -75 -50 -25
0
25
50
75 100 125 150
JUNCTION TEMPERATURE (C)
GM7110
7
MICROELECTRONICS
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Power Management GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
Typical Performance Characteristics
Figure 4. Quiescent Current
20 18 QUIESCENT CURRENT (mA) 16 14 12 10 8 6 4 0 ILOAD = 200mA ILOAD = 1A VOUT = 5V Measured at Ground Pin TJ = 25C
Figure 5. Maximum Power Dissipation(TO-263)
POWER DISSIPATION (W)
4 3 2 1 0
qJA = 32C/ W qJA = 37C/ W
qJA = 50C/ W qJA = 73C/ W
10
20
30
40
50
60
0
INPUT VOLTAGE (V)
10 20 30 40 50 60 70 80 90 100 AMBIENT TEMPERATURE (C)
Figure 6. Minimum Operating Voltage
5.0 4.5 4.0 INPUT VOLTAGE (V) CURRENT(A) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 VOUT = 1.23V ILOAD = 120 mA -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (C) Adjustable Version Only
Figure 7. ON / OFF Pin Current (Sinking)
8 7 6 5 4 3 2 1 0 -40C VIN = 40V TJ 125C
0 -50
0
5
10
15
20
25
ON / OFF PIN VOLTAGE (V)
GM7110
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MICROELECTRONICS
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Power Management GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
TO-220-5 PACKAGE OUTLINE DIMENSIONS
9.97 0.20 9.90 0.20 3.60 0.20 1.30 0.10 1.70 1.50 DP0.20 9.20 0.20 3.70 0.20 4.60 15.90 0.20 3 7.0 0.20 28.78 MAX 9.20 0.20 3 3 8.70 2.80 0.10 4.50 0.20 8.0 0.20
+0.1 1.30 -0.05
7.0
8.40 1.2
13.08 0.20
3-R0.2
5-0.8 0.10
0.50 -0.05
+0.1
2.40 0.20
1.7(TYP) 3 3
2 - R 0.3
Unit: mm
10.00 0.20
TO-263-5 PACKAGE OUTLINE DIMENSIONS
9.90 0.40 15 1.20 3 4.60 1.50 DP0.20 9.20 4.50 1.30
Pad Layout
15.3 2.00 0.10 3 17.5 9 3.8 1.7 11.5
1.20
4.90
0.75 R0.30
2.40 R0.30 2.54 0.50
1.70 TYP (1.70 0.20)
0.80 0.40 1.75
10.0 8.0 7.0 4.40
1.07
3 R 0.3
3 0.90 R 0.45 7.2 9.20 15.30 10.00
Units: mm
4.90
Unit: mm
GM7110
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MICROELECTRONICS
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Power Management GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
TO-220-5B PACKAGE OUTLINE DIMENSIONS
0.18 0.004 4.57 0.1 0.4 0.006 10.16 0.15 0.108 0.006 2.74 0.15 0.05 0.004 1.27 0.1 0.151 0.002 3.84 0.05 0.05 0.004 1.27 0.1 0.032 0.004 0.81 0.1 0.138 0.004 3.5 0.1 0.9645 0.0075 24.5 0.2
0.4985 0.0075 12.66 0.2
0.358 0.008 9.1 0.2 0.996 0.008 25.3 0.2 0.105 0.006 2.76 0.15
0.213 0.004 5.4 0.1
0.1535 0.0035 3.9 0.1 0.220 TYP 1.700 TYP 0.268 0.004 0.68 0.1
0.173 0.006 4.4 0.15 0.331 0.006 8.4 0.15 0.0165 0.0045 0.42 0.11
(
Inches ) mm
TO-252-5 PACKAGE OUTLINE DIMENSIONS
0.256 0.004 6.5 0.1 0.024 Ref 0.600 Ref 0.212 0.003 5.375 0.075
29 0.5
0.02 0.001 0.51 0.02
Pad Layout
7
0.24 0.004 6.10 0.1 0.2835 0.0035 7.20 0.1
0.039 0.002 1.0 0.05 0.39 0.008 9.9 0.2
7
3 0.9
3.81 1.27
0.025 0.002 0.64 0.05
0.06 0.004 1.525 0.1
6.25
GM7110
0.0235 0.0015 0.60 0.025
0.050BSC 1.270BSC
0.003 0.002 0.07 0.05
Units: mm
0.091 0.002 2.3 0.05
(
Inches ) mm
10
MICROELECTRONICS
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Power Management GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
ORDERING NUMBER
GM 7110 A TB5 T
Gamma Micro. Shipping R: Tape & Reel T: Tube
Circuit Type Package TA5: TO-263-5 TB5: TO-220-5 TC5: TO-252-5 Output Voltage A: Adj, 3.3: 3.3V 5.0: 5.0V, 12: 12V 15: 15V
GM7110
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MICROELECTRONICS
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Power Management GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
12
GM7110

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