M24308-2-13 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 3V to 5V Regulating Charge Pumps for SIM Cards

19-1376; Rev 1; 12/98
3V to 5V Regulating
Charge Pumps for SIM Cards
General Description
The MAX1686 provides power for dual-voltage sub-
scriber ID module (SIM) cards in portable applications
such as GSM cellular phones. Designed to reside in the
portable unit (cellular phone handset), the 1MHz charge
pump converts a 2.7V to 4.2V input to regulated 5V out-
put. The MAX1686H has a nominal output voltage of
5.0V, while the MAX1686 is set to 4.75V to reduce SIM-
card current drain. The charge pump has only 45µA qui-
escent supply current, which reduces to 3µA when a
3V-capable SIM card is being powered and the charge
pump is disabled. An internal input/output shorting
switch provides power for 3V SIM cards.
The MAX1686/MAX1686H require only three external
capacitors around their space-saving, thin (1mm) 8-pin
µMAX packages.
GSM Cellular Phones
PCS Phones
Portable POS Terminals
Personal Communicators
Applications
Features
o 2.7V to 4.2V Input Range
o 12mA min Charge-Pump Output Current
o 45µA Quiescent Supply Current
o 0.1µA Supply Current in Shutdown Mode
o 5.0V Regulated Charge-Pump Output (MAX1686H)
4.75V Regulated Charge-Pump Output (MAX1686)
o Input-Output Shorting Switch for 3V Cards
o Small External Components
(Uses a 0.047µF, 0.1µF, and a 2.2µF Capacitor)
o Output Driven to Ground in Shutdown Mode
o Super-Small 8-Pin µMAX Package
o Soft-Start and Short-Circuit Protection
PART
MAX1686EUA
MAX1686HEUA
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
8 µMAX
Typical Operating Circuit
Pin Configuration
INPUT
2.7V TO 4.2V
C_IN
C_X
CXN
IN
CXP
OUT
MAX1686
SHDN ^MAX1686H
3/5
GND
PGND
OUTPUT
V_IN OR 5V/20mA
C_OUT
TOP VIEW
3/5 1
SHDN 2
IN 3
GND 4
MAX1686
MAX1686H
8 OUT
7 CXP
6 CXN
5 PGND
µMAX
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