High Efficiency, Constant Current, Boost DC/DC White-LEDs Drive
Features
Operating Voltage：2.7V to 5.5V
High Operating Frequency：1MHz
High Output Voltage：28V
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Shutdown Current：<1µA
Over-Voltage Protection
Digital Dimming Control
Built-in Cycle-by-Cycle Current-Limiting Soft-Start Function
0.2V Low Reference Voltage
Tiny SOT-23-6 Package Applications
LED Module
Compact Back Light Module
Constant Current Source General Description
The G5126 boost converter contains a 0.7Ω internal switch. The IC operates at constant frequency 1MHz, allowing the u of tiny, low cost and low height in-ductors and capacitors. The IC operates from a 2.7V to 5.5V supply voltage. High inrush current at start-up is eliminated using the soft-start function. Constant frequency current mode PWM architecture results in low, predictable output noi. The G5126 includes cycle-by-cycle 850mA current limiting to maximum inductor current and over-temperature protection cir-cuit. The over-voltage protection will be enabled when VOUT exceeds 28V. The current of LED is t by a resistor connected between FB and GND. The G5126 is available in SOT-23-6 package.
Ordering Information
ORDER
NUMBER
MARKING
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PACKAGE
(Pb free)
G5126TB1U5126x -40°C to 85°C SOT-23-6 Note: TB: SOT-23-6
1 : Bonding Code
U: Tape & Reel
Pin Configuration Typical Application Circuit
LX GND FB F OUT
Absolute Maximum Ratings
IN to GND. . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to 7V LX, OVP to GND. . . . . . . . . . . . . . . . . . . . -0.3V to 35V EN to GND. . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VIN FB to GND. . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VIN Thermal Resistance Junction to Ambient, (θJA )*
SOT-23-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240°C/W
Continuous Power Dissipation (T A = +25°C)*
SOT-23-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400mW Operating Temperature Range 1 . . . . . -40°C to +85°C Junction Temperature . . . . . . . . . . . . . . . . . . . +150°C Storage Temperature . . . . . . . . . . . . -65°C to +150°C Reflow Temperature (soldering, 10c) . . . . . . .260°C
Note:
见得1. It is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the -40°C to 85°C operating
temperature range are assured by design, characterization and correlation with statistical process controls.
* Plea refer to “Recommended Minimum Footprint ”.
Electrical Characteristics V IN =V EN =3.6V, T A = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Input Voltage 2.7 --- 5.5 V
Over-voltage Threshold --- 28 --- V Over-voltage Hysteresis --- 2 --- V
Quiescent Current
No Switching
---
0.2
0.3
mA
Shutdown Supply Current EN=0V
--- 0 1 µA
V IH
1.5 --- --- V EN Input Level
V IL --- --- 0.8 V
UVLO RISING
2 2.25 2.5 V
Oscillator Frequency --- 1 --- MHz
Maximum Duty Cycle
--- 90 --- % Feedback Regulation Voltage 0.19 0.2 0.21 V
NMOS R DS-ON I LX
=
我爱我的家作文200mA --- 700 ---
m Ω LX Leakage Current EN=0, V LX =
28V --- --- 10 µA
Switching Current Limit V IN =3.0V,duty cycle=80% 500 850 1300 mA
Trigger --- 120 --- °C Over Temperature Hysteresis --- 20 --- °C Soft Start
--- 0.5 --- ms
Typical Performance Characteristics
(V CC = +3.6V, V EN = +3.6V, L=47µH, T A =25°C, unless otherwi noted.)
Dimming Control Waveform-3 LEDs Dimming Control Waveform-6 LEDs
Stability Waveform-3 LEDs
Stability Waveform-6 LEDs
Inrush Current Waveform-3 LEDs
Inrush Current Waveform-6 LEDs
Typical Performance Characteristics (Continued)
OVP Waveform
Recommended Minimum Footprint
SOT-23-6
Pin Descriptions
PIN Name FUNCTION
1LX Power Switching Output
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Ground
Pin.
2 GND
Feedback
Input.
3 FB
4 EN Enable Input. Drive EN high to turn on the regulator, drive it low to turn it off.
input. Connect to the output.
protection
5 OVP
Over-voltage
6 IN Power Input Pin. It must be bypasd with a low-ESR capacitor.
Block Diagram
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LX FB
GND EN
OVP
