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PRELIMINARY
GM7130
3A STEP-DOWN VOLTAGE REGULATORS
3.3V, 5V, 12V, 15V, Adjustable output versions Adjustable version output voltage range 1.23V to 37V 4% max over line and load conditions 3A output current Input voltage range 7V to 40V Requires only 4 external components High efficiency TTL shutdown capability, low power standby mode Thermal shutdown, current limit protection Uses standard inductors 52 kHz fixed frequency internal oscillator P+ Product Enhancement tested
Applications:
Pre-regulator for linear regulators High-efficiency step-down buck regulator On-card/board switching regulators Positive to negative converter (buck-boost)
The GM7130 series of regulators provide all the active functions for a step-down (buck) switching regulator, and drive 3A load with excellent line and load regulation. GM7130's are available in fixed output voltages 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 fixedfrequency oscillator. The GM7130 series are highefficiency replacements for popular three-terminal linear regulators, requiring a smaller heatsink or even no heatsink. The GM7130's perform well with standard inductors from several manufacturers, simplifying the design of switch-mode power supplies. The GM7130 series guarantee 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 A (typical) standby current. The output switch has cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.
Connection Diagrams
TO-263 (S) 5-Lead Surface-Mount Package Top View
5 - ON/OFF 4 - Feedback 3 - Ground 2 - Output 1 - VIN
Straight Leads 5-Lead TO-220 (T) Top View
5 - ON/OFF 4 - Feedback 3 - Ground 2 - Output 1 - VIN
TAB IS GND
GND
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PRELIMINARY
GM7130
3A STEP-DOWN VOLTAGE REGULATORS
Absolute Maximum Ratings
Rating
Maximum Supply Voltage ON/OFF Pin Input Voltage Output Voltage to Ground (Steady State) Power Dissipation Storage Temperature Range Maximum Junction Temperature Minimum ESD Rating (C=100pF, R=1.5kS) Lead Temperature (Soldering, 10 seconds)
Value
45 -0.3 #V # VIN -1.0 Internally Limited -65 to +150 +150 2 +260
Unit
V V V C C kV C
BLOCK DIAGRAM
Unregulated DC Input
VIN
1
CIN
Internal Regulator
ON/OFF ON/OFF
5
+
4
Feedback Fixed Gain Error AMP
+ -
Comparator
+ Driver
3 AMP Switch Output
2
D1
Reset Thermal Shutdown Current Limit
L1
1.23V Band - Gap Reference
+
COUT
52 kHz Oscillator
3
GND
L O A D
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PRELIMINARY
GM7130
3A STEP-DOWN VOLTAGE REGULATORS
ELECTRICAL CHARACTERISTICS: GM7130-3.3
(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, I LOAD = 0.5A 6V # VIN # 40V, 0.5A # I LOAD# 3.0A VIN = 12V, I LOAD = 3.0A
Symbol
VOUT VOUT
Min
3.234 3.168 / 3.135 -
Typ
3.3 3.3 75
Max
3.366 3.432 / 3.465 -
Unit
V V %
0
ELECTRICAL CHARACTERISTICS: GM7130-5.0
(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, I LOAD = 0.5A 8V # VIN # 40V, 0.5A # I LOAD# 3.0A VIN = 12V, I LOAD = 3.0A
Symbol
VOUT VOUT
Min
4.900 4.800 / 4.750 -
Typ
5.0 5.0 77
Max
5.100 5.200 / 5.250 -
Unit
V V %
0
ELECTRICAL CHARACTERISTICS: GM7130-12
(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, I LOAD = 0.5A 15V # VIN # 40V, 0.5A # I LOAD# 3.0A VIN = 15V, I LOAD = 3.0A
Symbol
VOUT VOUT
Min
11.76 11.52 / 11.40 -
Typ
12.0 12.0 88
Max
12.24 12.48 / 12.60 -
Unit
V V %
0
ELECTRICAL CHARACTERISTICS: GM7130-15
(Specifications with standard type face are for T = 25C, and those with boldface type apply over full Operating Temperature Range)
J
Parameter
Output Voltage Output Voltage Efficiency
Conditions
VIN = 25V, I LOAD = 0.5A 18V # VIN # 40V, 0.5A # I LOAD# 3.0A VIN = 18V, I LOAD = 3.0A
Symbol
VOUT VOUT
Min
14.70 14.40 / 14.25 -
Typ
15.0 15.0 88
Max
15.30 15.60 / 15.75 -
Unit
V V %
0
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PRELIMINARY
GM7130
3A STEP-DOWN VOLTAGE REGULATORS
ELECTRICAL CHARACTERISTICS: GM7130-ADJ
(Specifications with standard type face are for T = 25C, and those with boldface type apply over full Operating Temperature Range)
J
Parameter
Feedback Voltage
Conditions
Symbol
Min
1.217
Typ
1.230
Max
1.243
Unit
V
VIN = 12V, I LOAD = 0.5A, VOUT = 5V 18V # VIN # 40V, 0.5A # I LOAD# 3.0A VOUT = 5V VIN = 12V, I LOAD = 3A, VOUT = 5V
VOUT
Feedback Voltage
VOUT
1.193 / 1.180
1.230
1.267 / 1.280
V
Efficiency
0
-
77
-
%
ELECTRICAL CHARACTERISTICS: All Output Voltage Versions
(Specifications with standard type face are for T J = 25C, 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 IN IN IN 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
VOUT = 5V (Adjustable Version Only) (Note 11) IOUT = 3A (Note 4) (Note 5) (Notes 4, 11) (Notes 6, 7) (Note 6) ON / OFF Pin = 5V (OFF) T Package, Junction to Ambient (Note 8) T Package, Junction to Ambient (Note 8) T Package, Junction to Case T Package, Junction to Ambient (Note 10) VOUT = 0V VOUT = Nominal Output Voltage ON / OFF Pin = 5V (OFF) Output = 0 V Output = -1 V
Symbol
Ib fO VSAT DC ICL IL IQ ISTBY
Min
47 / 42 93 4.2 / 3.5 2.2 / 2.4 -
Typ
50 52 1.4 98 5.8 7.5 5 50 65 45 2 50 1.4 1.2 12 0
Max
100 / 500 58 / 63 1.8 / 2.0 6.9 / 7.5 2 30 10 200 1.0 / 0.8 30 10
Unit
nA kHz V % A mA mA
:A
Thermal Resistance
2 JA 2 JA 2 JC 2 JA
VIH VIL VIH IIL
C/W
ON / OFF Pin Logic Input Level
V V
:A :A
ON / OFF Pin Current ON / OFF Pin = 0V (ON)
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PRELIMINARY
GM7130
3A STEP-DOWN VOLTAGE REGULATORS
ELECTRICAL CHARACTERISTICS NOTES
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. 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 Statistical 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 GM7130 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, 2JA is 50C/W, with 1 square inch
of copper area, 2JA is 37C/W, and with 1.6 or more square inches of copper area, 2JA 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 the GM7130 by lowering the minimum duty cycle from 5% down to approximately 2%.
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PRELIMINARY
GM7130
3A STEP-DOWN VOLTAGE REGULATORS
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 2 below should be kept as short as possible. Singlepoint grounding (as indicated in Figure 2) or ground plane construction should be used for best results. When using the Adjustable version, place the programming resistors as close as possible to the GM7130, to keep the sensitive feedback wiring short.
Fixed Output Voltage Versions
Feedback +VIN
1
GND
GM7130FIXED OUTPUT 3
ON/OFF
4
Output L1 100 H VOUT
Vin Unregulated DC Input
5
2
+
CIN 100 F
+
D1 COUT 1000 F
L O A D
CIN -- 100 F, 75V, Aluminum Electrolytic COUT -- 1000 F, 25V, Aluminum Electrolytic D1 -- Schottky, MBR360 L1 -- 100 H, Pulse Eng. PE-92108 R1 -- 2k, 0.1% R2 -- 6.12k, 0.1%
(Figure 2)
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PRELIMINARY
GM7130
3A STEP-DOWN VOLTAGE REGULATORS
Adjustable Output Voltage Versions
Feedback +VIN
GM7130-ADJ
4
Output L1 100 H R2 D1
1
7V - 40V Unregulated DC Input GND
VOUT = 5.0 V
3
ON/OFF
5
2
+
100 F CIN
+
COUT 1000 F R1
L O A D
VOUT = VREF R2 = R1
(1+
V
REF
R2 R1
)
( VOUT - 1 )
(Figure 2)
where VREF = 1.23V, R1 between 1k and 5k.
TYPICAL APPLICATION (Fixed Output Voltage Versions)
7V - 40V Unregulated DC Input
Feedback +VIN
4 GM7130 - 5.0
Output GND 100 H L1
1
3
ON/OFF
5
2
+5V Regulated Output 3A Load
+
CIN 100 F
+
D1 1N5822
COUT 1000 F
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PRELIMINARY
GM7130
3A STEP-DOWN VOLTAGE REGULATORS
ORDERING INFORMATION
Output Voltage A D J. 3.3V 5.0V 12V 15V
PACKAGE GM7130 TO- 263-5 TO- 220-5
GM7130-ATA5 GM7130-3.3TA5 GM7130-5.0TA5 GM7130-12TA5 GM7130-15TA5 GM7130-ATB5 GM7130-3.3TB5 GM7130-5.0TB5 GM7130-12TB5 GM7130-15TB5
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PRELIMINARY
GM7130
3A STEP-DOWN VOLTAGE REGULATORS
Symbol A A1 b c c1 D E E1 e e1 F L
Dimensions In Millimeters Min Max 4.470 4.670 2.520 2.820 0.710 0.910 0.310 0.530 1.170 1.370 9.850 10.150 8.200 8.600 11.760 12.160 1.700TYP 6.700 6.900 2.590 2.890 13.500 13.900 3.790 3.890
Dimensions In Inches Min Max 0.176 0.184 0.099 0.111 0.028 0.036 0.012 0.021 0.046 0.054 0.388 0.400 0.323 0.339 0.463 0.479 0.067TYP 0.264 0.272 0.102 0.114 0.531 0.547 0.149 0.153
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PRELIMINARY
GM7130
3A STEP-DOWN VOLTAGE REGULATORS
Symbol A A1 B b c c1 D E e e1 L L1 L2 V
Dimensions In Millimeters Min Max 4.470 4.670 0.000 0.150 1.560 1.760 0.710 0.910 0.310 0.530 1.170 1.370 9.880 10.180 8.200 8.600 1.700TYP 6.700 6.900 15.140 15.540 5.080 5.480 2.340 2.740 5.600REF
Dimensions In Inches Min Max 0.176 0.184 0.000 0.006 0.061 0.069 0.028 0.036 0.012 0.021 0.046 0.054 0.389 0.401 0.323 0.339 0.067TYP 0.264 0.272 0.596 0.612 0.200 0.216 0.092 0.108 0.220REF
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