SC4520
SC4520 is 3A Step-Down Switching Regulator manufactured by SEMTECH.
Description
The SC4520 is a current mode switching regulator with an integrated switch and an adjustable frequency with enable function. The integrated switch allows for costeffective, low power solutions with a peak switch current of 3 amps. An adjustable high frequency of 100k Hz to 600k Hz provides for fast dynamic response and instantaneous duty cycle adjustment as the input varies, making the device ideal for CPE applications where the input is a wall plug power. Low shutdown current also .. makes the this device an excellent choice for portable applications where conserving battery life is of prime concern.
Features
Wide operating voltage range: 4.4V to 24V Integrated 3 Amp switch 100k Hz to 600k Hz adjustable frequency operation Current mode control Precision enable threshold SO-8 EDP package. Lead-free product, fully WEEE and Ro HS pliant
Applications
XDSL modems CPE equipment DC-DC point of load applications Portable equipment Digtial consumer electronics
Typical Application Circuit
D1
1 VIN Enable C3 2 5 8 BST IN EN FSET SW 3 6
C1 L1 VOUT
GND 4
FB P
R1 7 D2 R2 C2
Rosc
C4 R3
Revision: December 13, 2006
.semtech.
POWER MANAGEMENT Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Exposure to Absolute Maximum rated conditions for extended periods of time may affect device reliability.
Parameter Input Supply Voltage Boost Pin Above VSW Boost Pin Voltage EN Pin Voltage
..
Symbol VIN (VBST
- VSW) V BST V EN V FB IFB V FS E T θJA TJ TSTG TLEAD ESD
Limits -0.3 to +28 16 -0.3 to +32 -0.3 to +24 -0.3 to +6 1 +3 36.5 150 -65 to +150 300 2
Units V V V V V m A V °C/W °C °C °C k V
FB Pin Voltage FB Pin Current FSET Pin Voltage Thermal Impedance Junction to Ambient (1) Maximum Junction Temperature Storage Temperature Range Lead...
