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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1686 Datasheet

Step-Up DC-DC Converters with Precise / Adaptive Current Limit for GSM

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MAX1686 pdf
19-1426; Rev 0; 2/99
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
Step-Up DC-DC Converters with
Precise, Adaptive Current Limit for GSM
General Description
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.
GSM Phones
Wireless Handsets
PC Cards (PCMCIA)
Applications
Features
o Low 450mA Peak Battery Current
Provides 2A, 5V GSM Burst
o 90% Efficiency
o Internal Power MOSFETs and Current-Sense
Resistor
o Output Disconnects from Input During Shutdown
o 3µA Shutdown Current
o Precise Voltage-Controlled Current Limit
(MAX1687)
o Adaptive Constant-Recharge-Time Capability
(MAX1688)
o 1.25V to 6V Adjustable Output
o 2.7V to 6V Input Range
(1 Li-Ion cell or 3 NiMH cells)
o Switching Frequency Can Exceed 1MHz
o Standby Mode Disables DC-DC During
Transmission Burst
o Low Inrush Current at Start-Up
Ordering Information
PART*
TEMP. RANGE
MAX1687EUE
-40°C to +85°C
MAX1687ESA
-40°C to +85°C
MAX1688EUE
-40°C to +85°C
MAX1688ESA
-40°C to +85°C
*U.S. and foreign patents pending.
PIN-PACKAGE
16 TSSOP
8 SO
16 TSSOP
8 SO
Typical Operating Circuit
Pin Configurations
TOP VIEW
IN 1
16 OUT
IN 2
15 OUT
LX1 3
14 LX2
LX1 4
LIM [CHG] 5
MAX1687
MAX1688
13 LX2
12 PGND
FB 6
11 PGND
REF 7
10 AGND
N.C. 8
9 ON
[ ] ARE FOR MAX1688
TSSOP
Pin Configurations continued at end of data sheet.
Patent pending
2.7V TO 6V
1 Li-lon
OR
3 NiMH
OR
3 ALKALINE
ON
OFF
0 TO 1V
CONTROL INPUT
IN LX1
LX2
OUT
MAX1687
MAX1688
FB
ON
(LIM)
REF [CHG]
( ) ARE FOR MAX1687
[ ] ARE FOR MAX1688
GND
VOUT
UP TO 6V
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1686 Datasheet

Step-Up DC-DC Converters with Precise / Adaptive Current Limit for GSM

No Preview Available !

MAX1686 pdf
Step-Up DC-DC Converters with
Precise, Adaptive Current Limit for GSM
ABSOLUTE MAXIMUM RATINGS
IN, ON, LX1, CHG, LIM, FB, OUT, REF to GND .......-0.3V to +7V
LX2 to GND ..............................................................-0.3V to +8V
IN, LX1 Average Current..........................................................1A
Continuous Power Dissipation (TA = +70°C)
TSSOP (derate 5.7mW/°C above +70°C) ....................457mW
SO (derate 5.88mW/°C above +70°C) .........................471mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) ............................+300° C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = VON = +3V, VLIM = 1V (MAX1687), VCHG = 1V (MAX1688), VFB = 1.5V, VOUT = 6V, TA = 0°C to +85°C, unless otherwise noted.
Typical values are at TA = +25°C.)
PARAMETER
Input Voltage Range
Input Undervoltage Lockout
Output Voltage Range
Input Supply Current
Shutdown Delay
Reference Voltage
FB Set Voltage
FB Transconductance
ICHG Source Current
Peak Current
Ripple Current
Sense Resistor
ON Input Low Voltage
ON Input High Voltage
Input Current
N-Channel On-Resistance
P-Channel On-Resistance
Precharge On-Resistance
LX2 Leakage Current
SYMBOL
CONDITIONS
IN rising, 1% hysteresis
tDELAY
VREF
gmFB
IPEAK
IRIPPLE
RSENSE
VIL
VIH
IFB
ION
ILIM
VFB = 1.5V
Shutdown, VIN = 4.2V, LX2 connected to LX1,
VOUT = 0, ON = GND
IREF = 0 to 10µA
VFB rising, 2% hysteresis
VFB = 1.125V, VOUT = 3V (MAX1688)
VFB = 0, VOUT = 3V (MAX1688)
VLIM = VCHG = 1V
VLIM = VCHG = 0.65V
VLIM = VCHG = 1V
VIN = 2.7V
VIN = 6V
VIN = 4.2V
VFB = 1.5V
VON = 0 or 3V
VLIM = 1V
TA = +25°C
TA = 0°C to +85°C
VIN = 2.7V
VIN = 2.7V
VIN = 4V, VFB = 0, VOUT = 0
VIN = VLX2 = 6V, VOUT = VON = 0
MIN
2.7
2.4
VREF
0.7
1.225
1.212
0.18
60
0.744
0.46
170
1.8
1.5
TYP
2.5
2
3
1.2
1.25
1.250
0.2
110
0.8
0.5
200
0.1
0.05
0.02
0.02
0.4
0.3
30
0.05
MAX
6
2.6
6
4
UNITS
V
V
V
mA
10 µA
1.8
1.275
1.288
0.22
0.856
0.54
230
0.18
0.6
ms
V
V
mmho
µA
A
mA
V
V
0.2
0.1
µA
0.1
2
0.8
0.7
70
10 µA
2 _______________________________________________________________________________________


Part Number MAX1686
Description Step-Up DC-DC Converters with Precise / Adaptive Current Limit for GSM
Manufacturer Maxim
Total Page 12 Pages
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