MAX710 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters

19-1254; Rev 0; 7/97
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3.3V/5V or Adjustable,
Step-Up/Down DC-DC Converters
_______________General Description
The MAX710/MAX711 integrate a step-up DC-DC con-
verter with a linear regulator to provide step-up/down
voltage conversion. They are optimized for battery
applications where the input varies above and below
the regulated output voltage. They have an input range
from +1.8V to +11V. Typical efficiency when boosting
battery inputs is 85%.
The MAX710/MAX711 can be configured for minimum
noise or optimum efficiency. Shutdown control turns off
the part completely, disconnecting the input from the
output (I_SHDN = 0.2µA). Standby control turns off only
the step-up converter and leaves the low-power linear
regulator active (I_Q = 7µA).
The MAX710 has a preset 3.3V or 5V output voltage.
The MAX711 has an adjustable output that can be set
from +2.7V to +5.5V with two resistors. Both devices
come in 16-pin narrow SO packages.
________________________Applications
Single-Cell, Lithium-Powered Portable Devices
Digital Cameras
2- to 4-Cell AA Alkaline Hand-Held Equipment
3.3V and Other Low-Voltage Systems
2-, 3-, and 4-Cell Battery-Powered Equipment
Battery-Powered Devices with AC Input Adapters
____________________________Features
o Step-Up/Down Voltage Conversion
o +1.8V to +11V Input Range
o Output:
5V/250mA at V_IN = 1.8V
5V/500mA at V_IN = 3.6V
o No External FETs Required
o Load Disconnected from Input in Shutdown
o Battery Drain:
200µA No-Load (V_IN = 4V)
7µA in Standby
0.2µA when Off
o Low-Noise and High-Efficiency Modes
______________Ordering Information
PART
MAX710C/D
MAX710ESE
MAX711C/D
MAX711ESE
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
16 Narrow SO
Dice
16 Narrow SO
__________Typical Operating Circuit __________________Pin Configuration
+1.8V TO +11V
INPUT
C1
ON
OFF
ON
STBY
3.3V
5V
N/E
LBI+
LBO
SHDN _MAX710 LX
STBY
PS
3/5
OUT
LBI-
REF PGND GND ILIM
C3
0.1µF
L1
C2
OUTPUT
3.3V/5V
C4
TOP VIEW
LX 1
PGND 2
ILIM 3
SHDN 4
STBY 5
3/5 (FB) 6
N/E 7
LBO 8
( ) IS FOR THE MAX711.
MAX710
MAX711
SO
16 LX
15 PGND
14 GND
13 REF
12 PS
11 LBI+
10 LBI-
9 OUT
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