_______________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
= 0.2A). Standby control turns off only
the step-up converter and leaves the low-power linear
regulator active (I
Q
= 7A).
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:
200A No-Load (V
IN
= 4V)
7A in Standby
0.2A when Off
o
Low-Noise and High-Efficiency Modes
MAX710/MAX711
3.3V/5V or Adjustable,
Step-Up/Down DC-DC Converters
________________________________________________________________
Maxim Integrated Products
1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
LX
LX
PGND
GND
REF
PS
LBI+
LBI-
OUT
TOP VIEW
MAX710
MAX711
SO
PGND
ILIM
3/5 (FB)
SHDN
STBY
N/E
LBO
( ) IS FOR THE MAX711.
__________________Pin Configuration
MAX710
LBI+
LBO
N/E
SHDN
OFF
ON
STBY
3/5
LBI-
REF
PGND
C3
0.1
F
GND
ILIM
LX
PS
C4
C1
C2
L1
OUTPUT
3.3V/5V
+1.8V TO +11V
INPUT
OUT
5V
3.3V
ON
STBY
__________Typical Operating Circuit
19-1254; Rev 0; 7/97
PART
MAX710
C/D
MAX710ESE
MAX711
C/D
0C to +70C
-40C to +85C
0C to +70C
TEMP. RANGE
PIN-PACKAGE
Dice
16 Narrow SO
Dice
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
______________Ordering Information
MAX711ESE
-40C to +85C
16 Narrow SO
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.
MAX710/MAX711
3.3V/5V or Adjustable,
Step-Up/Down DC-DC Converters
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
PS
= 5.6V, STBY = PS, C
REF
= 0.1F, C
OUT
= 4.7F, T
A
= -40C to +85C, unless otherwise noted. Typical values are at
T
A
= +25C.) (Note 1)
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.
PS, LX, OUT to GND............................................-0.3V to +11.5V
ILIM, SHDN, STBY, FB, 3/5, N/E, LBO,
LBI-, LBI+, REF to GND ...........................-0.3V to (V
PS
+ 0.3V)
PGND to GND .......................................................-0.3V to +0.3V
REF Short Circuit to GND ...........................................Continuous
I
OUT
...................................................................................700mA
Continuous Power Dissipation (T
A
= +70C)
SO (derate 8.70mW/C above +70C) ..........................696mW
Operating Temperature Range ...........................-40C to +85C
Storage Temperature Range .............................-65C to +160C
Junction Temperature ......................................................+150C
Lead Temperature (soldering, 10sec) .............................+300C
ILIM = GND
ILIM = PS
V
LX
= 5.6V
MAX711, V
PS
= 2.7V
MAX710, V
PS
= 3.7V
V
STBY
= 0V, linear regulator
V
PS
= 5.6V
FB = 1.25V
T
A
= -40C to +85C, I
REF
= 0
T
A
= 0C to +85C, I
REF
= 0
MAX711
V
STBY
= V
SHDN
= logic high, current measured
into PS pin; I
LOAD
= 0
V
STBY
= 0V
V
SHDN
= 0V
MAX711, OUT = FB
CONDITIONS
A
1.1
1.5
1.95
LX Current Limit
0.5
0.8
1.3
A
0.1
1
LX Leakage Current
0.6
1.2
LX On-Resistance
0.3
0.9
0.2
0.6
nA
1
50
FB Input Current
mV
1.18
1.25
1.31
FB Voltage
V
0.9
Full Load Start-Up Voltage
1.20
1.25
1.29
mA
10
Standby Output Current
V
1.23
1.28
1.32
Reference Voltage
1.24
1.28
1.31
V
FB
5.5
Output Voltage-Adjustment Range
A
100
140
Quiescent Current
A
7
16
Standby Quiescent Current
A
0.1
5
Shutdown Quiescent Current
UNITS
MIN
TYP
MAX
PARAMETER
T
A
= 0C to +85C
T
A
= -40C to +85C
0mA
I
LOAD
250mA
MAX711, OUT = FB
%
0.1
1
Load Regulation
3/5 = low,
I
OUT
= 0 to 250mA
V
4.8
5.0
5.2
T
A
= 0C to +85C
4.6
5.0
5.3
T
A
= -40C to +85C
3/5 = high, I
OUT
= 0 to
250mA, V
PS
= 4.7V
3.17
3.3
3.43
T
A
= 0C to +85C
3.05
3.3
3.55
T
A
= -40C to +85C
Output Voltage (MAX710)
0 < I
OUT
< 250mA, STBY = PS
%
0.5
Output Voltage Load Regulation
STBY = PS, 1.8V to 5V
%/V
0.3
Output Voltage Line Regulation
N/E = GND (Note 2)
N/E = PS
V
1.8
7.0
1.8
11.0
Input Voltage
MAX710/MAX711
3.3V/5V or Adjustable,
Step-Up/Down DC-DC Converters
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
PS
= 5.6V, STBY = PS, C
REF
= 0.1F, C
OUT
= 4.7F, T
A
= -40C to +85C, unless otherwise noted. Typical values are at
T
A
= +25C.) (Note 1)
Note 1:
Specifications at -40C are guaranteed by design, not production tested.
Note 2:
Guaranteed by design (see Table 1).
Note 3:
The LBO comparator provides the correct result as long as one input is within the specified input range.
STBY, SHDN, N/E, 3/5, ILIM
STBY = PS
CONDITIONS
V
0.4
Input Low Voltage
C
150
Thermal Shutdown
UNITS
MIN
TYP
MAX
PARAMETER
STBY, SHDN, N/E, 3/5, ILIM
STBY, SHDN, N/E, 3/5, ILIM
(Note 3)
V
LBI-
, V
LBI+
= 1.25V
mV
6
40
100
Hysteresis
V
1.6
Input High Voltage
nA
1
50
Input Bias Current
V
1.2
10
Input Range LBI-, LBI+
nA
1
50
Input Bias Current LBI-, LBI+
V
LBI-
= 1.25V
I
LBO
= 2mA, V
LBI-
= 1.25V, V
LBI+
= 1V
I
LBO
= -300A, V
LBI-
= 1.25V, V
LBI+
= 2V
mV
-25
+25
LBI/LBO Offset Voltage
0.4
V
V
PS
- 0.2V
LBO Output Voltage
V
OUT
= 5.0V
0.7
1.3
Output PFET Resistance
V
PS
= 3V, V
OUT
= 0V
A
0.4
3
Output PFET Leakage
MAX711, V
OUT
= 2.7V
1.6
3.0
MAX710, V
OUT
= 3.0V
1.3
2.4
STBY = PS
C
20
Thermal Shutdown Hysteresis
LOGIC
LBI/LBO COMPARATOR
__________________________________________Typical Operating Characteristics
(T
A
= +25C, unless otherwise noted.)
MAX710/MAX711
3.3V/5V or Adjustable,
Step-Up/Down DC-DC Converters
4
_______________________________________________________________________________________
90
50
0.1
10
1000
1
100
EFFICIENCY vs. LOAD CURRENT--
HIGH-EFFICIENCY AND LOW-NOISE MODES
(V
OUT
= 5V)
60
MAX710/711 TOC04
LOAD CURRENT (mA)
EFFICIENCY (%)
70
80
V
OUT
= 5V
V
IN
= 2.5V
N/E = GND
N/E = PS
ILIM = 0.8A
ILIM = 1.5A
60
10
0.01
10
1
1000
0.1
100
LINEAR-REGULATOR POWER-SUPPLY
REJECTION RATIO vs. FREQUENCY
20
MAX710/711 TOC08
FREQUENCY (kHz)
PSRR (dB)
30
40
50
55
15
25
35
45
90
50
0.1
10
1000
1
100
EFFICIENCY vs. LOAD CURRENT--
HIGH-EFFICIENCY AND LOW-NOISE MODES
(V
OUT
= 3.3V)
60
MAX710/711 TOC05
LOAD CURRENT (mA)
EFFICIENCY (%)
70
80
V
OUT
= 3.3V
V
IN
= 2.5V
ILIM = 0.8A
ILIM = 0.8A
ILIM = 1.5A
LOW-NOISE MODE
HIGH-EFFICIENCY MODE
ILIM = 1.5A
0
200
600
800
400
1200
1400
1000
1600
0
4
2
6
8
10
12
NO-LOAD BATTERY CURRENT
vs. INPUT VOLTAGE
MAX710/711 TOC06
INPUT VOLTAGE (V)
SUPPLY CURRENT (A)
N/E = GND
ILIM = GND (1.5A)
ILIM = PS (0.8A)
0
0.2
0.6
0.4
0.8
1.0
1
3
4
5
2
6
8
7
9
10 11
SHUTDOWN CURRENT
vs. INPUT VOLTAGE
MAX710/711 TOC09
INPUT VOLTAGE (V)
SHUTDOWN CURRENT (A)
1000
10
1.0
1.4
2.2
2.6
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
100
MAX710/711 TOC07
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
1.8
1.2
2.0
1.6
2.4
ILIM = GND
ILIM = PS
N/E = GND
N/E = PS
90
50
0.1
10
1000
1
100
EFFICIENCY vs. OUTPUT CURRENT--
HIGH-EFFICIENCY MODE
(V
OUT
= 5V)
60
MAX710/711 TOC01
OUTPUT CURRENT (mA)
EFFICIENCY (%)
70
80
V
IN
= 1V
V
OUT
= 5V
N/E = GND
V
IN
= 3.6V
V
IN
= 2.5V
V
IN
= 5.6V
V
IN
= 1.8V
90
50
0.1
10
1000
1
100
EFFICIENCY vs. OUTPUT CURRENT--
HIGH-EFFICIENCY MODE
(V
OUT
= 3.3V)
60
MAX710/711 TOC02
OUTPUT CURRENT (mA)
EFFICIENCY (%)
70
80
V
OUT
= 3.3V
N/E = GND
V
IN
= 2.5V
V
IN
= 1V
V
IN
= 1.8V
0
0.6
0.4
0.2
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0
100
50
150
200
250
MINIMUM START-UP INPUT VOLTAGE
vs. LOAD CURRENT
MAX710/711 TOC03
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
V
OUT
= 5V
N/E = PS
MAX710/MAX711
3.3V/5V or Adjustable,
Step-Up/Down DC-DC Converters
_______________________________________________________________________________________
5
LINE-TRANSIENT RESPONSE
A
B
MAX710/711 TOC10
A: V
OUT
= 3.3V (100mV/div, AC COUPLED), N/E = GND
B: V
IN
= 2V TO 4V, I
OUT
= 100mA
2ms/div
A: V
OUT
= 3.3V (50mV/div, AC COUPLED), N/E = PS
B: I
OUT
= 10mA TO 100mA
LOAD-TRANSIENT RESPONSE
A
B
MAX710/711 TOC11
1ms/div
V
IN
= 2.5V, I
OUT
= 20mA, N/E = GND
V
OUT
= 5V (20mV/div, AC COUPLED), I
OUT
= 20mA
200
s/div
OUTPUT RIPPLE (HIGH-EFFICIENCY MODE)
MAX710/711 TOC12
V
IN
= 2.5V, I
OUT
= 20mA, N/E = PS
V
OUT
= 5V (20mV/div, AC COUPLED), I
OUT
= 20mA
OUTPUT RIPPLE (LOW-NOISE MODE)
MAX710/711 TOC13
200
s/div
A: V
OUT
(2V/div), I
OUT
= 100mA
B: V
SHDN
(2V/div)
START-UP DELAY
A
B
MAX710/711 TOC14
20
s/div
A: V
OUT
(2V/div), I
OUT
= 100mA
B: V
SHDN
(2V/div)
TURN-OFF DELAY
A
B
MAX710/711 TOC15
200
s/div
____________________________Typical Operating Characteristics (continued)
(T
A
= +25C, unless otherwise noted.)
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