MAX1686 Maxim, MAX1686 Datasheet
MAX1686
Manufacturer Part Number
MAX1686
Description
Step-Up DC-DC Converters with Precise / Adaptive Current Limit for GSM
Manufacturer
Maxim
Datasheet
1.MAX1686.pdf
(12 pages)
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The MAX1687/MAX1688 step-up DC-DC converters deliv-
er up to 2W from a single Li-Ion or three NiMH cells. The
devices are ideal for burst-load applications such as GSM
cell phones and wireless LANs, where the RF power
amplifiers require short, high current bursts. The
MAX1687/MAX1688 reduce battery surge current by slow-
ly charging a reservoir capacitor, which supplies the nec-
essary peak energy for the load current burst. As a result,
the peak battery current is limited, thus maximizing battery
life and minimizing battery voltage sag and transient dips.
An internal synchronous rectifier provides over 90% con-
version efficiency and eliminates the need for an external
Schottky diode. A logic shutdown mode reduces the shut-
down current to only 3µA. The devices can be disabled
during current bursts (RF transmit mode) to eliminate
switching noise.
The switching frequency of the MAX1687/MAX1688, con-
trolled by the selected inductor, can exceed 1MHz. Two
external resistors set the output voltage from 1.25V to 6V.
The MAX1687 controls peak battery current, while the
MAX1688 features a more advanced, adaptive constant-
recharge-time algorithm that maximizes battery life. The
MAX1687/MAX1688 are available in thin 16-pin TSSOP
(1.1mm max height) or standard 8-pin SO packages.
19-1426; Rev 0; 2/99
†
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Patent pending
Pin Configurations continued at end of data sheet.
[ ] ARE FOR MAX1688
TOP VIEW
GSM Phones
Wireless Handsets
PC Cards (PCMCIA)
LIM [CHG]
N.C.
LX1
LX1
REF
FB
IN
IN
________________________________________________________________ Maxim Integrated Products
Precise, Adaptive Current Limit for GSM
1
2
3
4
5
6
8
7
General Description
MAX1687
MAX1688
TSSOP
Pin Configurations
Applications
16
15
14
13
12
11
10
9
OUT
OUT
LX2
LX2
PGND
PGND
AGND
ON
Step-Up DC-DC Converters with
* U.S. and foreign patents pending.
MAX1687EUE
MAX1687ESA
MAX1688EUE
MAX1688ESA
3 ALKALINE
Low 450mA Peak Battery Current
Provides 2A, 5V GSM Burst
90% Efficiency
Internal Power MOSFETs and Current-Sense
Resistor
Output Disconnects from Input During Shutdown
3µA Shutdown Current
Precise Voltage-Controlled Current Limit
(MAX1687)
Adaptive Constant-Recharge-Time Capability
(MAX1688)
1.25V to 6V Adjustable Output
2.7V to 6V Input Range
(1 Li-Ion cell or 3 NiMH cells)
Switching Frequency Can Exceed 1MHz
Standby Mode Disables DC-DC During
Transmission Burst
Low Inrush Current at Start-Up
( ) ARE FOR MAX1687
[ ] ARE FOR MAX1688
1 Li-lon
3 NiMH
OFF
PART*
CONTROL INPUT
OR
OR
2.7V TO 6V
0 TO 1V
ON
Typical Operating Circuit
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
(LIM)
ON
REF
IN
Ordering Information
LX1
MAX1687
MAX1688
GND
LX2
[CHG]
OUT
FB
16 TSSOP
16 TSSOP
8 SO
8 SO
PIN-PACKAGE
Features
UP TO 6V
V
OUT
1
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