MAX5008 Datasheet, PDF (1/7 Pages) Maxim Integrated Products – Regulated 5V USB Charge Pump with Programmable Current Limit

19-2426; Rev 0; 4/02
Regulated 5V USB Charge Pump with
Programmable Current Limit
General Description
The MAX5008 charge-pump regulator generates a reg-
ulated 5V output up to 125mA with a 2.95V to 5.5V input
voltage range. The device includes resistor-program-
mable overcurrent limit. The MAX5008 requires a mini-
mum number of external components for normal
operation. The high 1MHz switching frequency allows
the use of small surface-mount ceramic capacitors.
The fault-protection circuitry limits the output current
when it exceeds the limit set by an external resistor.
The output current can range from 1mA to 150mA to
accommodate circuit requirements. A FAULT output
indicates when the device is in current limit or the out-
put is out of regulation.
A low-power shutdown mode reduces supply current to
less than 1µA and places the output in a high-imped-
ance state. The MAX5008 is offered in a space-saving
10-pin µMAX package that is only 1.1mm high.
Applications
Flash Memory Supplies
USB Host Devices
Battery-Powered Systems
3.3V to 5V Local Conversion
Features
o Regulated 5V Output Up to 125mA
o Indefinite Short-Circuit Protection
o Adjustable Output Current Limit
o No Inductors Required
o 0.1µA Shutdown Current
o Thermal Shutdown
o Fault Output Indicates Overcurrent or Output
Voltage Out of Regulation
o 2.95V to 5.5V Input Voltage Range
o 10-Pin µMAX Package
PART
MAX5008CUB
Ordering Information
TEMP RANGE
0°C to +70°C
PIN-PACKAGE
10 µMAX
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
C_X
0.68µF
V_IN
2.95V TO 5.5V
4.7µF
100kΩ
7
9
CXN
CXP
8
IN
5
SHDN
2
OUT
200Ω*
MAX5008
3
FAULT
1
RCS
47nF*
200Ω*
CEXT ¹⁰
GND
PGND
I_OUT
4
6
R_CS
0.4Ω
V_OUT
5V
C_OUT
4.7µF
C_EXT
6.8µF
*USE IF PRECISION CURRENT LIMIT IS REQUIRED.
________________________________________________________________ Maxim Integrated Products 1
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