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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1643 Datasheet

Step-Up DC-DC Converters

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MAX1643 pdf
19-1183; Rev 0; 6/97
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
High-Efficiency, Step-Up
DC-DC Converters for 1V Inputs
_______________General Description
The MAX1642/MAX1643 are high-efficiency, low-voltage,
step-up DC-DC converters intended for devices pow-
ered by a single alkaline cell. They feature low quies-
cent supply currents and are supplied in the ultra-small
µMAX package, which is only 1.1mm high. The guaran-
teed start-up voltage is 0.88V.
Each device consists of an internal 1, N-channel
MOSFET power switch; a built-in synchronous rectifier
that acts as the catch diode; an oscillator; a reference;
and pulse-frequency-modulation (PFM) control circuitry.
Both devices feature an independent undervoltage
comparator (PFI/PFO). The MAX1642 also includes a
2µA logic-controlled shutdown mode. The MAX1643
offers a dedicated low-battery detector (BATTLO) in
lieu of shutdown.
The output voltage for each device is preset to 3.3V
±4%, or can be adjusted from +2V to +5.2V using only
two resistors.
________________________Applications
Pagers
Remote Controls
Pointing Devices
Personal Medical Monitors
Single-Cell Battery-Powered Devices
____________________________Features
o Built-In Synchronous Rectifier
o 0.88V Guaranteed Start-Up
o Ultra-Small µMAX Package: 1.1mm High
o 83% Efficiency
o 4µA Quiescent Supply Current into BATT Pin
o 2µA Logic-Controlled Shutdown (MAX1642)
o Two Undervoltage Detectors (MAX1643)
o 2V to 5.2V Output Range
o 20mA Output Current at 1.2V Input
o Reverse Battery Protection
______________Ordering Information
PART
MAX1642C/D
MAX1642EUA
MAX1643C/D
MAX1643EUA
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice*
8 µMAX
Dice*
8 µMAX
*Dice are tested at TA = +25°C.
Note: To order these devices shipped in tape and reel, add a -T
to the part number.
_________________Pin Configurations
TOP VIEW
__________Typical Operating Circuit
INPUT
0.88V TO 1.65V 100µH
22µF
ON
OFF
LOW-BATTERY
DETECTOR INPUT
LX OUT
MAX1642
BATT
SHDN
PFI
GND
PFO
FB
OUTPUT
3.3V
22µF
LOW-BATTERY
DETECTOR OUTPUT
BATT 1
PFI 2
PFO 3
SHDN 4
MAX1642
8 OUT
7 LX
6 GND
5 FB
µMAX
BATT 1
PFI 2
BATTLO 3
PFO 4
MAX1643
8 OUT
7 LX
6 GND
5 FB
µMAX
________________________________________________________________ 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 408-737-7600 ext. 3468.
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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1643 Datasheet

Step-Up DC-DC Converters

No Preview Available !

MAX1643 pdf
High-Efficiency, Step-Up
DC-DC Converters for 1V Inputs
ABSOLUTE MAXIMUM RATINGS
BATT to GND ...........................................................-0.3V to 6.0V
BATT Forward Current ..........................................................0.5A
OUT to GND.............................................................-0.3V to 6.0V
OUT, LX Current.......................................................................1A
LX to GND................................................................-0.3V to 6.0V
SHDN, FB, BATTLO, PFO to GND ...........................-0.3V to 6.0V
PFI to GND ............................................................-0.3V to VBATT
Reverse Battery Current (TA = +25°C) (Note 1) ...............220mA
Continuous Power Dissipation
µMAX (derate 4.1mW/°C above 70°C)..........................330mW
Operating Temperature Range
MAX1642EUA/MAX1643EUA ............................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+300°C
Note 1: The reverse battery current is measured from the Typical Operating Circuit’s input terminal to GND when the battery is con-
nected backward. A reverse current of 220mA will not exceed package dissipation limits but, if left for an extended time
(more than 10 minutes), may degrade performance.
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
(VBATT = VSHDN = 1.3V, ILOAD = 0mA, FB = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Minimum Operating Input Voltage VBATT(MIN)
Maximum Operating Input Voltage
0.7
1.65
V
V
Start-Up Voltage (Note 2)
Start-Up Voltage Tempco
RL = 3k, TA = +25°C
0.88
-2
V
mV/°C
Output Voltage
VOUT
VFB < 0.1V
3.16 3.30 3.44
V
Output Voltage Range
External feedback
2.0 5.2 V
FB Set Voltage
N-Channel On-Resistance
P-Channel On-Resistance
VFB External feedback
VOUT = 3.3V
VOUT = 3.3V
1.18 1.225 1.27
1 1.5
1.5 2.2
V
P-Channel Catch-Diode Voltage
IDIODE = 100mA, P-channel switch off 0.8 V
On-Time Constant
Off-Time Tracking Ratio (Note 3)
K
RATIO
0.9V < VBATT < 1.5V (tON = K / VBATT)
0.9V < VBATT < 1.5V, VOUT = 3.3V
17 25 35 V-µs
1 1.5
Quiescent Current into OUT
Quiescent Current into BATT
IQOUT
IQBATT
VOUT = 3.5V
11 18 µA
4 6.5 µA
Shutdown Current into OUT
ISHDN,OUT VOUT = 3.5V (MAX1642)
0.1 1 µA
Shutdown Current into BATT
Efficiency
ISHDN,BATT VBATT = 1.0V (MAX1642)
η ILOAD = 20mA
2 3.5 µA
80 %
FB Input Current
PFI Trip Voltage
VFB = 1.3V
Falling PFI, hysteresis = 1%
10 nA
590 614 632 mV
PFI Input Current
PFO, BATTLO Low Output Voltage
PFO, BATTLO Leakage Current
BATTLO Trip Voltage
SHDN Input Low Voltage
SHDN Input High Voltage
SHDN Input Current
VPFI = 650mV
10 nA
VOL VPFI = 0V, VOUT = 3.3V, ISINK = 1mA
0.4 V
VPFI = 650mV, VPFO = 6V
1 µA
VOUT = 3.3V, hysteresis = 2% (MAX1643) 0.96 1.0 1.04
V
VIL % of VBATT (MAX1642)
20 %
VIH % of VBATT (MAX1642)
80
%
(MAX1642)
10 nA
2 _______________________________________________________________________________________
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Part Number MAX1643
Description Step-Up DC-DC Converters
Maker Maxim
Total Page 12 Pages
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