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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX858 Datasheet

Step-Up DC-DC Converters

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19-0211; Rev 4; 5/96
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
3.3V/5V or Adjustable-Output,
Step-Up DC-DC Converters
_______________General Description
The MAX856–MAX859 are high-efficiency, CMOS, step-
up, DC-DC switching regulators for small, low input volt -
age or battery-powered systems. The MAX856/MAX858
accept a positive input voltage between 0.8V and V OUT
and convert it to a higher, pin-selectable output voltage of
3.3V or 5V. The MAX857/MAX859 adjustable versions
accept 0.8V to 6.0V input voltages and generate higher
adjustable output voltages in the 2.7V to 6.0V range.
Typical efficiencies are greater than 85%. Typical quies -
cent supply current is 25µA (1µA in shutdown).
The MAX856–MAX859 combine ultra-low quiescent supply
current and high efficiency to give maximum battery life. An
internal MOSFET power transistor permits high switching
frequencies. This benefit, combined with internally set peak
inductor current limits, permits the use of small, low-cost
inductors. The MAX856/MAX857 have a 500mA peak
inductor current limit. The MAX858/MAX859 have a 125mA
peak inductor current limit.
________________________Applications
3.3V to 5V Step-Up Conversion
Palmtop Computers
Portable Data-Collection Equipment
Personal Data Communicators/Computers
Medical Instrumentation
2-Cell & 3-Cell Battery-Operated Equipment
Glucose Meters
__________Typical Operating Circuit
____________________________Features
o 0.8V to 6.0V Input Supply Voltage
o 0.8V Typ Start-Up Supply Voltage
o 85% Efficiency at 100mA
o 25µA Quiescent Current
o 1µA Shutdown Mode
o 125mA and 500mA Switch-Current Limits Permit
Use of Low-Cost Inductors
o Up to 500kHz Switching Frequency
o ±1.5% Reference Tolerance Over Temperature
o Low-Battery Detector (LBI/LBO)
o 8-Pin SO and µMAX Packages
______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX856CSA
0°C to +70°C
8 SO
MAX856CUA
0°C to +70°C
8 µMAX
MAX856C/D
0°C to +70°C
Dice*
MAX856ESA
MAX856MJA
-40°C to +85°C
-55°C to +125°C
8 SO
8 CERDIP
MAX857CSA
0°C to +70°C
8 SO
MAX857CUA
0°C to +70°C
8 µMAX
MAX857C/D
0°C to +70°C
Dice*
MAX857ESA
MAX857MJA
-40°C to +85°C
-55°C to +125°C
8 SO
8 CERDIP
Ordering Information continued at end of data sheet.
* Dice are tested at TA = +25°C only.
Contact factory for availability.
INPUT
0.8V TO VOUT
ON/OFF
3V/5V SELECT
LOW-BATTERY
DETECTOR
INPUT
SHDN
LX
MAX856
3/5 OUT
LBI
REF GND
LBO
OUTPUT
47µH 5V AT 100mA
OR
3.3V AT 125mA
1N5817
68µF
LOW-BATTERY
DETECTOR OUTPUT
__________________Pin Configuration
TOP VIEW
SHDN 1
3/5 2
REF 3
LBO 4
MAX856
MAX858
8 LX
7 GND
6 OUT
5 LBI
SO/µMAX
SHDN 1
FB 2
REF 3
LBO 4
MAX857
MAX859
8 LX
7 GND
6 OUT
5 LBI
SO/µMAX
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX858 Datasheet

Step-Up DC-DC Converters

No Preview Available !

3.3V/5V or Adjustable-Output,
Step-Up DC-DC Converters
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (OUT to GND) ...................................-0.3V, +7V
SS—Hw—LDiB—tcNI–,h,RVLEoBFlOt,a3gt/oe–5–,G(FLNBXDttoo...GG..NN...DD...)...........................................................................-..0.......3....V....,....(..V....O....--U00T..33+VV,,0++.377VVV)
Reference Current (IREF) ..................................................2.5mA
Continuous Power Dissipation (TA = +70°C)
SO (derate 5.88mW/°C above +70°C) .........................471mW
µMAX (derate 4.1mW/°C above +70°C) ......................330mW
CERDIP (derate 8.00mW/°C above +70°C) .................640mW
Reverse Battery Current (TA +45°C, Note 1) .................750mA
Operating Temperature Ranges
MAX85_C_ _ ......................................................0°C to +70°C
MAX85_E_ _ ....................................................-40°C to +85°C
MAX85_MJA .................................................-55°C to +125°C
Junction Temperature .....................................................+150°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10sec) ............................+300°C
Note 1: Reverse battery current is measured from the Typical Operating Circuit’s battery input terminal to GND when the battery is
connected backwards. A reverse current of 750mA will not exceed the SO or CERDIP package dissipation limits but, if left
for an extended time (more than ten 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
(Circuits of Figure 2, VIN = 2.5V, ILOAD = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Output Voltage
Minimum Start-Up
Supply Voltage
Minimum Operating Voltage
Quiescent Supply Current in
3.3V Mode (Note 2)
2V VIN 3V
ILOAD = 0mA
CONDITIONS
MAX856, 3/–5– = 0V, 0mA ILOAD 100mA
MAX856, 3/–5– = 3V, 0mA ILOAD 150mA
MAX857, VOUT = 5V, 0mA ILOAD 100mA
MAX858, 3/–5– = 0V, 0mA ILOAD 25mA
MAX858, 3/–5– = 3V, 0mA ILOAD 35mA
MAX859, VOUT = 5V, 0mA ILOAD 25mA
ILOAD = 0mA, 3/–5– = 3V, LBI = 1.5V, VOUT = 3.47V,
(FB = 1.5V, MAX857/MAX859 only)
MIN
4.80
3.17
4.80
4.80
3.17
4.80
TYP
5.0
3.3
5.0
5.0
3.3
5.0
0.8
0.8
MAX UNITS
5.20
3.43
5.20
5.20
V
3.43
5.20
1.8 V
V
25 60 µA
No Load Battery Current
Output set for 3.3V, measured at VIN in Figure 2, R3 omitted.
Shutdown Quiescent Current S—H—D—N– = 0V, 3/–5– = 3V, LBI = 1.5V, VOUT = 3.47V,
(Note 2)
(FB = 1.5V, MAX857/MAX859 only)
MAX85_C
MAX85_E/M
Peak Inductor Current Limit
MAX856/MAX857
MAX858/MAX859
Reference Voltage
No REF load
Reference-Voltage Regulation 3/–5– = 3V, -20µA REF load 250µA, CREF = 0.22µF
LBI Input Threshold
With falling edge
LBI Input Hysteresis
LBO Output Voltage Low
ISINK = 2mA
LBO Output Leakage Current LBO = 5V
60 µA
1.23
1.22
1
500
125
1.25
0.8
1.25
25
1
5
1.27
2.0
1.28
0.4
1
µA
mA
V
%
V
mV
V
µA
2 _______________________________________________________________________________________
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Part Number MAX858
Description Step-Up DC-DC Converters
Maker Maxim
Total Page 12 Pages
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