Rainbow Electronics MAX1686H - Manual

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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.
Applications
GSM Cellular Phones
PCS Phones
Portable POS Terminals
Personal Communicators
Features
♦ 2.7V to 4.2V Input Range
♦ 12mA min Charge-Pump Output Current
♦ 45µA Quiescent Supply Current
♦ 0.1µA Supply Current in Shutdown Mode
♦ 5.0V Regulated Charge-Pump Output (MAX1686H)
4.75V Regulated Charge-Pump Output (MAX1686)
♦ Input-Output Shorting Switch for 3V Cards
♦ Small External Components
(Uses a 0.047µF, 0.1µF, and a 2.2µF Capacitor)
♦ Output Driven to Ground in Shutdown Mode
♦ Super-Small 8-Pin µMAX Package
♦ Soft-Start and Short-Circuit Protection
MAX1686/MAX1686H
3V to 5V Regulating
Charge Pumps for SIM Cards
________________________________________________________________ Maxim Integrated Products 1
1
2
3
4
8
7
6
5
OUT
CXP
CXN
PGND GND
IN
SHDN
3/5
MAX1686
MAX1686H
µ
MAX
TOP VIEW
MAX1686
MAX1686H
IN
CXN CXP
GND PGND
C
IN
INPUT
2.7V TO 4.2V
OUTPUT
V IN OR 5V/20mA
C X
C
OUT
SHDN
3/5
OUT
Typical Operating Circuit
19-1376; Rev 1; 12/98
PART
MAX1686 EUA -40°C to +85°C
TEMP. RANGE PIN-PACKAGE
8 µMAX
Pin Configuration
Ordering Information
MAX1686H EUA -40°C to +85°C 8 µMAX