SC4210A Datasheet, PDF (1/11 Pages) Semtech Corporation – 8-Pin N-FET Linear Regulator Controller

SC4210A
8-Pin N-FET Linear
Regulator Controller
POWER MANAGEMENT
Description
The SC4210A linear regulator controller includes all the
features required for an extremely low dropout linear
regulator that uses an external N-channel MOSFET as
the pass transistor. The device can operate from input
voltages as low as 1.75V and can provide high current
levels, thus providing an efficient linear solution for cus-
tom processor voltages, bus termination voltages, and
other logic level voltages down to 0.5V. The onboard
charge pump creates a gate drive voltage capable of driv-
ing an external N-MOSFET which is optimal for low drop-
out voltage and high efficiency. The wide versatility of
this IC allows the user to optimize the setting of both
current limit and output voltage for applications beyond
or between standard 3-terminal linear regulator ranges.
The 8-pin controller IC features a duty ratio current limit-
ing technique that provides peak transient loading capa-
bility while limiting the average power dissipation of the
pass transistor during fault conditions.
Features
‹ On-board charge pump to drive external N-MOSFET
‹ Input voltage as low as 1.75V to 5.5V
‹ Duty ratio mode over-current protection
‹ Extremely low dropout voltage
‹ Low external parts count
‹ Output voltages as low as 0.5V
‹ MSOP-8 package
Applications
‹ Telecom and networking cards
‹ Industrial applications
‹ Wireless infrastructure
‹ Set-top boxes
‹ Post regulated power supplies
The SC4210A is available in an MSOP-8 surface mount
package.
Typical Application Circuit
Vin = 3.3V
C1
22µF
C2
0.01
C3
0.01
R2
24k
C4
150pF
R1
0.015
1 _VDD
2 _CAP
3 _GND
4 _COMP
CS ⁸
CT ⁷
FB ⁶
VOUT ⁵
U1
SC4210A
C5
0.1
Q1
FDB7030BL
R3
39k
R4
1.30k
C6
0.01
R5
499
Vout = 1.8V @ 6Ap-k
C7opt.
10µF
Revision: October 26, 2004
1
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