器件名称: ADP1611
功能描述: Constant-Frequency, Current-Mode Step-Up DC/DC Controller
文件大小: 819.45KB 共32页
简 介:Constant-Frequency, Current-Mode Step-Up DC/DC Controller ADP1621
FEATURES
92% efficiency (no sense resistor required) ±1.0% initial accuracy IC supply voltage range: 2.9 V to 5.5 V Power-input voltage as low as 1.0 V Capable of high supply input voltage (>5.5 V) with an external NPN or a resistor VIN UVLO and 35 mA shunt regulator External slope compensation with 1 resistor Programmable operating frequency (100 kHz to 1.5 MHz) with 1 resistor Lossless current sensing for switch-node voltage <30 V Resistor current sensing for switch-node voltage >30 V Synchronizable to external clock Current-mode operation for excellent line and load transient responses 10 μA shutdown current Current limit and thermal overload protection Soft start in 2048 clock cycles
TYPICAL APPLICATION CIRCUIT
VIN = 3.3V L1 4.7H D1 C3 1F 10V C4 0.1F 10V PIN IN RS 80 CS R1 35.7k 1% VOUT = 5V 1A
ADP1621
SDSN COMP RCOMP 9.09k CCOMP 1.8nF FREQ GND RFREQ 31.6k 1% GATE PGND FB M1
COUT1 1F 10V
COUT2 10F 10V
R2 11.5k 1%
COUT3 150F 6.3V ×2
C2 120pF
C1 47F 6.3V
AGND fOSC = 600kHz C1 = MURATA GRM31CR60J476M COUT3 = SANYO POSCAP 6TPE150M L1 = TOKO FDV0630-4R7M
M1 = VISHAY Si7882DP D1 = VISHAY SSA33L
Figure 1. High Efficiency Output Boost Converter in Lossless Mode, 3.3 V Input, 5 V Output (Bootstrapped)
100 90 80
APPLICATIONS
APD bias Portable electronic equipment Isolated dc/dc converter Step-up/step-down dc/dc converter LED driver for laptop computer and navigation system LCD backlighting
EFFICIENCY (%)……
