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PDF GM7001 Data sheet ( Hoja de datos )
| Número de pieza | GM7001 | |
| Descripción | Low-voltage Switching Regulator Controller | |
| Fabricantes | Gamma Microelectronics | |
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GM7001
BIPOLAR LOW VOLTAGE SWITCHING REGULATOR CONTROLLER
Supply voltage operating range from 1.8 to 15 V
Low current consumption: 5.5 mA (typical) operating, 1 µA or less stand-by
High speed operation up to 1 MHz
Error amplifier gain is set in the chip to minimize peripheral components
Soft-start circuit on-chip
Timer-latch short-circuit detection circuit (SCP) on-chip
Totem-pole output with adjustable on/off current for NPN transistors
Stand-by function
SOP-8, SOL-8 and SSOP-8 packages available
The GM7001 is a single-channel low-voltage switching regulator control IC with soft-start function and short-circuit
detection, capable of 1MHz operation. With its low minimum operating voltage of 1.8V and minimal current
consumption, the GM7001 is ideal for power supplies in battery-operated equipment.
PIN ASSIGNMENT
-IN
SCP
VCC
BR/CTL
1
2
3
4
8 FB
7 OSC
6 GND
5 OUT
(TOP VIEW)
PIN No. SYMBOL
1 -IN
2 SCP
3 VCC
4 BR/CTL
5 OUT
6 GND
7 OSC
8 FB
I/O DESCRIPTION
I Error amplifier inverting input pin
- Soft start and SCP setting capacitor connection pin
- Power supply pin
I Output current setting and control pin
O Totem-pole type output pin
- Ground pin
- Capacitor and resistor connection pin for setting the oscillation frequency
O Error amplifier output pin
Revision 1, May 2002
1 www.gammamicro.com
1 page  
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GM7001
BIPOLAR LOW VOLTAGE SWITCHING REGULATOR CONTROLLER
SETTING THE TIME CONSTANT FOR SOFT START AND SHORT CIRCUIT DETECTION
1. Soft Start
At power on, the capacitor CPE connected to the SCP pin begins charging. The PWM comparator compares the soft
start setting voltage (as a proportion of the voltage at the SCP pin) with the sawtooth waveform. This comparison
controls the ON duty of the OUT pin, causing soft start operation. Upon completion of soft start operation, the voltage
at the SCP pin remains low, the soft start setting voltage remains high, and the circuit enters into output short circuit
detection wait state.
Soft start time (The time until the output ON duty reaches approximately 50%)
tS [s] ≅ 0.35 × CPE [µF]
2. Short Circuit Protection
If the switching regulator output suddenly drops due to load effect, the error amplifier output (FB pin) is fixed at VOM+and
capacitor CPE begins charging. When the voltage at the SCP pin reaches approximately 0.8V, the output pin is set low
and the SCP pin remains low.
Once the protection circuit activates, operation of the circuit can be restored by resetting the power supply.
Short circuit detection time
tPE [s] ≅ 0.8 × CPE [µF]
MEASUREMENT CIRCUIT DIAGRAM
VCC
22 µH
(5 V)
18 kΩ
GM7001
5
IOUT
4
390 Ω
VOUT
10 µF
2 kΩ
-IN
Revision 1, May 2002
5 www.gammamicro.com
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet GM7001.PDF ] | |
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