Ver: 1.1

Nov 17, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

2

G5121

Global Mixed-mode Technology Inc.

Absolute Maximum Ratings

FB to GND.....................….........................-0.3V to VCC

SW, OVP to GND……….……..…………..-0.3V to +24V

Operating Temperature.….…………….....-40°C to 85°C

Junction Temperature......................….................125°C

Storage Temperature……....……..….….-65°C to 150°C

Reflow Temperature (soldering, 10sec)……...…260°C

ESD Rating (Human Body Model)………….….……2kV

Stress beyond those listed under “Absolute Maximum Rating” may cause permanent damage to the device.

Electrical Characteristics

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Voltage Range

2.5

---

6

V

Input Voltage UVLO

1.7

2.0

2.3

V

Over Voltage Protection Threshold

trigger

18.5

19.5

21

V

Over Voltage Protection Threshold

release

13.5

15

16.5

V

OVP Pin Input Current

---

40

60

µA

---

80

120

µA

---

---

2

mA

Quiescent Current

---

0.1

1

µA

Initial Accuracy

244

254

264

mV

FB Comparator Trip Point

Temperature Coefficient

---

100

---

ppm/°C

Switching Frequency

0.8

1.0

1.2

MHz

Maximum Duty

85

---

---

%

---

0.7

1.0

Ω

Switch Leakage Current

---

0.1

10

µA

Switch Current Limit

500

600

700

mA

Soft Start Time

---

120

---

µs

SHDN

Pin Voltage High

2

---

---

V

SHDN

Pin Voltage Low

---

---

0.8

V