General Description
The MAX1700/MAX1701 are high-efficiency, low-noise,
step-up DC-DC converters intended for use in battery-
powered wireless applications. They use a synchro-
nous-rectified pulse-width-modulation (PWM) boost
topology to generate 2.5V to 5.5V outputs from battery
inputs such as one to three NiCd/NiMH cells or one Li-
Ion cell. Both devices have an internal 1A, 130m N-
channel MOSFET switch and a 250m P-channel
synchronous rectifier.
With their internal synchronous rectifier, the MAX1700/
MAX1701 deliver 5% better efficiency than similar non-
synchronous converters. They also feature a pulse-
frequency-modulation (PFM) standby mode to improve
efficiency at light loads, and a 3µA shutdown mode.
The MAX1700/MAX1701 come in 16-pin QSOP pack-
ages (which occupy the same space as an 8-pin SO).
The MAX1701 includes two comparators to generate
power-good and low-battery warning outputs. It also
contains a gain block that can be used to build a linear
regulator using an external P-channel pass device.
For higher-power outputs, refer to the MAX1703. For
dual outputs (step-up and linear regulator), refer to the
MAX1705/MAX1706. For an on-board analog-to-digital
converter, refer to the MAX848/MAX849.
The MAX1701 evaluation kit is available to speed design
time.
Applications
Digital Cordless Phones Personal Communicators
PCS Phones Palmtop Computers
Wireless Handsets Hand-Held Instruments
Two-Way Pagers
Features
Up to 96% Efficiency
1.1 V
IN
Guaranteed Start-Up
0.7V to 5.5V Input Range
Up to 800mA Output
Step-Up Output (adjustable from 2.5V to 5.5V)
PWM/PFM Synchronous-Rectified Topology
External Clock or Internal 300kHz Oscillator
3µA Logic-Controlled Shutdown
Power-Good Output (MAX1701)
Low-Battery Comparator (MAX1701)
Uncommitted Gain Block (MAX1701)
MAX1700/MAX1701
1-Cell to 3-Cell, High-Power (1A),
Low-Noise, Step-Up DC-DC Converters
________________________________________________________________
Maxim Integrated Products
1
PGNDGNDFB
ONA
REF
ONB
POUT
LX
OUT
ON
INPUT
0.7V TO 5.5V
OR
OFF
OFF
ON
SYNC
PWM
PFM
OUTPUT
3.3V OR ADJ
UP TO 800mA
CLK/SEL
MAX1700
Pin Configurations
TOP VIEW
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
I.C. I.C.
POUT
OUT
LX
PGND
FB
I.C.
I.C.
I.C. = INTERNAL CONNECTION. LEAVE OPEN OR CONNECT TO GND
MAX1700
QSOP
I.C.
REF
I.C.
CLK/SEL
GND
ONB
ONA
Typical Operating Circuit
19-4759; Rev 1; 1/99
PART
MAX1700EEE
-40°C to +85°C
TEMP. RANGE PIN-PACKAGE
16 QSOP
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
Ordering Information
MAX1701EEE
-40°C to +85°C 16 QSOP
Pin Configurations continued at end of data sheet.
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.
MAX1700/MAX1701
1-Cell to 3-Cell, High-Power (1A),
Low-Noise, Step-Up DC-DC Converters
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(CLK/SEL = ONA = ONB = FB = PGND = GND, OUT = POUT, V
OUT
= 3.6V (Note 6); MAX1701: AIN = LBN = GND, LBP = REF,
T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°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.
ONA, ONB, OUT, AO, POK, LBO to GND...................-0.3V, +6V
PGND to GND.....................................................................±0.3V
LX to PGND.....................................................-0.3V,V
POUT
+0.3V
CLK/SEL, AIN, REF, FB, LBP, LBN, POUT to GND............-0.3V,
V
OUT
+0.3V ...................................................................................
Continuous Power Dissipation (T
A
=+70°C)
16-QSOP (Derate 8.30mW/°C above +70°C) ...............667mW
Operating Temperature Ranges
MAX1700EEE, MAX1701EEE ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
CLK/SEL = GND
CLK/SEL = GND
CLK/SEL = OUT
I
LOAD
< 1mA, T
A
= +25°C
P-channel
N-channel
V
LX
= V
ONB
= V
OUT
= 5.5V
V
LX
= 0V, V
OUT
= 5.5V
V
ONB
= 3.6V
CLK/SEL = OUT, No load to full load
CLK/SEL = OUT (MAX1701)
CLK/SEL = OUT (MAX1700)
(Note 4)
V
OUT
= 1.5V
V
FB
< 0.1V, CLK/SEL = OUT, V
BATT
= 2.4V,
includes load regulation error for 0A I
LX
0.55A
Adjustable output, CLK/SEL = OUT, V
BATT
= 2.4V,
includes load regulation error for 0A I
LX
0.55A
CLK/SEL = GND (MAX1701)
V
FB
= 1.25V
CLK/SEL = GND (MAX1700)
CONDITIONS
mA20 120P-Channel Turn-Off Current
mA
250 400 550
N-Channel Current Limit
1100 1300 1600
0.25 0.5
Switch On-Resistance 0.13 0.28
0.2 0.45
µA0.1 20LX Leakage Current
µA0.1 20POUT Leakage Current
µA
140 300
125 250
Supply Current in Low-Noise
Mode (Note 6)
µA
55 110
Supply Current in Low-Power
Mode (Note 6)
35 70
V0.9 1.1
Minimum Start-Up Voltage
(Note 2)
V0.7 5.5Input Voltage Range (Note 1)
µA
320
Supply Current in Shutdown
%-1.6Load Regulation (Note 5)
V2.0 2.15 2.3
Output Voltage Lockout
Threshold
V2.5 5.5Output Voltage Adjust Range
kHz40 150 300Frequency in Start-Up Mode
V3.17 3.30 3.38Output Voltage (Note 3)
V1.210 1.24 1.255FB Regulation Voltage
nA0.01 20FB Input Current
UNITSMIN TYP MAXPARAMETER
CLK/SEL = GND
CLK/SEL = OUT
DC-DC CONVERTER
DC-DC SWITCHES
MAX1701
MAX1700 0.1 20
Input High Voltage (Note 7)
MAX1700/MAX1701
1-Cell to 3-Cell, High-Power (1A),
Low-Noise, Step-Up DC-DC Converters
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(CLK/SEL = ONA = ONB = FB = PGND = GND, OUT = POUT, V
OUT
= 3.6V (Note 6); MAX1701: AIN = LBN = GND, LBP = REF,
T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
-1µA < I
REF
< 50µA
I
REF
= 0
V
AIN
= 1.5V
I
SINK
= 1mA, V
OUT
= 3.6V or I
SINK
= 20µA, V
OUT
= 1V
To maintain input offset < ±5mV (at least one input must
be within this range)
I
AO
= 20µA
LBP falling, 15mV hysteresis
V
OUT
= V
POK
= 5.5V
I
SINK
= 1mA, V
OUT
= 3.6V or I
SINK
= 20µA, V
OUT
= 1V
Rising V
FB
Rising V
OUT
, V
FB
< 0.1V
10µA < I
AO
= 100µA
V
AIN
= 0.7V, I
AO
= 100µA
V
AIN
= 1.5V, V
AO
= 5.5V
CONDITIONS
mV515REF Load Regulation
V1.237 1.250 1.263Reference Output Voltage
V0.03 0.4LBO Output Low Voltage
V0.5 1.5
LBN, LBP Common Mode
Range
mV-5 ±0.5 5LBN, LBP Input Offset
µA0.01 1POK High Leakage Current
nA-30 30AIN Input Current
V1.237 1.25 1.263AIN Reference Voltage
V0.03 0.4POK Low Voltage
V1.1 1.12 1.14External Trip Level
V2.93 2.97 3.02Internal Trip Level
mmho5916Transconductance
V0.1 0.4AO Output Low Voltage
µA0.01 1AO Output High Leakage
UNITSMIN TYP MAXPARAMETER
V
LBP
= V
LBN
= 1.5V
V
OUT
= V
LBO
= 5V
nA20LBN, LBP Input Current
µA0.01 1LBO High Leakage
2.5V < V
OUT
< 5V mV0.2 5REF Supply Rejection
1.2V < V
OUT
< 5.5V, ONA and ONB
0.2V
OUT
1.2V < V
OUT
< 5.5V, ONA and ONB
2.5V < V
OUT
< 5.5V, CLK/SEL
0.8V
OUT
V
0.2V
OUT
Input Low Voltage (Note 7)
2.5V < V
OUT
< 5.5V, CLK/SEL
V
0.8V
OUT
Input High Voltage (Note 7)
CLK/SEL = OUT
ONA, ONB, and CLK/SEL
kHz260 300 340Internal Oscillator Frequency
µA-1 1Logic Input Current
kHz200 400
External Clock Frequency
Range
%80 86 90Oscillator Maximum Duty Cycle
ns100
Maximum CLK/SEL Rise/Fall
Time
ns200Minimum CLK/SEL Pulse Width
GAIN BLOCK (MAX1701)
POWER GOOD (MAX1701)
LOW-BATTERY COMPARATOR
REFERENCE
LOGIC AND CONTROL INPUTS

MAX1700EEE+T

Mfr. #:
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators 1-3 Cell 1A Step-Up DC/DC Converters
Lifecycle:
New from this manufacturer.
Delivery:
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