19-4759; Rev 1; 1/99
NUAL
KIT MA
ATION
ET
EVALU
TA SHE
WS DA
FOLLO
1-Cell to 3-Cell, High-Power (1A),
Low-Noise, Step-Up DC-DC Converters
General Description
Features
o
Up to 96% Efficiency
o
1.1 V
IN
Guaranteed Start-Up
o
0.7V to 5.5V Input Range
o
Up to 800mA Output
o
Step-Up Output (adjustable from 2.5V to 5.5V)
o
PWM/PFM Synchronous-Rectified Topology
o
External Clock or Internal 300kHz Oscillator
o
3µA Logic-Controlled Shutdown
o
Power-Good Output (MAX1701)
o
Low-Battery Comparator (MAX1701)
o
Uncommitted Gain Block (MAX1701)
MAX1700/MAX1701
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, 130mΩ N-
channel MOSFET switch and a 250mΩ 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.
Ordering Information
PART
MAX1700EEE
MAX1701EEE
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
16 QSOP
Applications
Digital Cordless Phones
PCS Phones
Wireless Handsets
Two-Way Pagers
TOP VIEW
I.C. 1
I.C. 2
REF 3
CLK/SEL 4
GND 5
I.C. 6
ONB 7
ONA 8
16 I.C.
15 POUT
14 OUT
Typical Operating Circuit
INPUT
0.7V TO 5.5V
Personal Communicators
Palmtop Computers
Hand-Held Instruments
Pin Configurations
ON
OFF
OFF
ON
PWM
PFM
OR
ONB
CLK/SEL
POUT
MAX1700
ONA
LX
OUTPUT
3.3V OR ADJ
UP TO 800mA
SYNC
MAX1700
13 LX
12 PGND
11 FB
10 I.C.
9
I.C.
REF
FB
OUT
GND PGND
QSOP
I.C. = INTERNAL CONNECTION. LEAVE OPEN OR CONNECT TO GND
Pin Configurations continued at end of data sheet.
________________________________________________________________
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 1-800-835-8769.
1-Cell to 3-Cell, High-Power (1A),
Low-Noise, Step-Up DC-DC Converters
MAX1700/MAX1701
ABSOLUTE MAXIMUM RATINGS
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
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
(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.)
PARAMETER
DC-DC CONVERTER
Input Voltage Range (Note 1)
Minimum Start-Up Voltage
(Note 2)
Frequency in Start-Up Mode
Output Voltage (Note 3)
FB Regulation Voltage
FB Input Current
Output Voltage Adjust Range
Output Voltage Lockout
Threshold
Load Regulation (Note 5)
Supply Current in Shutdown
Supply Current in Low-Power
Mode (Note 6)
Supply Current in Low-Noise
Mode (Note 6)
DC-DC SWITCHES
POUT Leakage Current
LX Leakage Current
Switch On-Resistance
V
LX
= 0V, V
OUT
= 5.5V
V
LX
= V
ONB
= V
OUT
= 5.5V
N-channel
P-channel
N-Channel Current Limit
P-Channel Turn-Off Current
CLK/SEL = OUT
CLK/SEL = GND
CLK/SEL = GND
1100
250
20
CLK/SEL = GND
CLK/SEL = OUT
0.1
0.1
0.2
0.13
0.25
1300
400
20
20
0.45
0.28
0.5
1600
550
120
mA
mA
Ω
µA
µA
(Note 4)
CLK/SEL = OUT, No load to full load
V
ONB
= 3.6V
CLK/SEL = GND (MAX1700)
CLK/SEL = GND (MAX1701)
CLK/SEL = OUT (MAX1700)
CLK/SEL = OUT (MAX1701)
MAX1700
MAX1701
I
LOAD
< 1mA, T
A
= +25°C
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
V
FB
= 1.25V
2.5
2.0
2.15
-1.6
0.1
3
35
55
125
140
20
20
70
110
250
300
40
3.17
1.210
0.7
0.9
150
3.30
1.24
0.01
5.5
1.1
300
3.38
1.255
20
5.5
2.3
V
V
kHz
V
V
nA
V
V
%
µA
µA
µA
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
1-Cell to 3-Cell, High-Power (1A),
Low-Noise, Step-Up DC-DC Converters
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.)
PARAMETER
GAIN BLOCK (MAX1701)
AIN Reference Voltage
AIN Input Current
Transconductance
AO Output Low Voltage
AO Output High Leakage
POWER GOOD (MAX1701)
Internal Trip Level
External Trip Level
POK Low Voltage
POK High Leakage Current
LOW-BATTERY COMPARATOR
LBN, LBP Input Offset
LBN, LBP Common Mode
Range
LBO Output Low Voltage
LBO High Leakage
LBN, LBP Input Current
REFERENCE
Reference Output Voltage
REF Load Regulation
REF Supply Rejection
LOGIC AND CONTROL INPUTS
Input Low Voltage (Note 7)
Input High Voltage (Note 7)
Input High Voltage (Note 7)
Logic Input Current
Internal Oscillator Frequency
Oscillator Maximum Duty Cycle
External Clock Frequency
Range
Minimum CLK/SEL Pulse Width
Maximum CLK/SEL Rise/Fall
Time
1.2V < V
OUT
< 5.5V, ONA and
ONB
2.5V < V
OUT
< 5.5V, CLK/SEL
1.2V < V
OUT
< 5.5V, ONA and
ONB
2.5V < V
OUT
< 5.5V, CLK/SEL
ONA,
ONB,
and CLK/SEL
CLK/SEL = OUT
0.8V
OUT
0.8V
OUT
-1
260
80
200
200
100
300
86
1
340
90
400
0.2V
OUT
0.2V
OUT
V
V
µA
kHz
%
kHz
ns
ns
I
REF
= 0
-1µA < I
REF
< 50µA
2.5V < V
OUT
< 5V
1.237
1.250
5
0.2
1.263
15
5
V
mV
mV
LBP falling, 15mV hysteresis
To maintain input offset < ±5mV (at least one input must
be within this range)
I
SINK
= 1mA, V
OUT
= 3.6V or I
SINK
= 20µA, V
OUT
= 1V
V
OUT
= V
LBO
= 5V
V
LBP
= V
LBN
= 1.5V
-5
0.5
0.03
0.01
±0.5
5
1.5
0.4
1
20
mV
V
V
µA
nA
Rising V
OUT
, V
FB
< 0.1V
Rising V
FB
I
SINK
= 1mA, V
OUT
= 3.6V or I
SINK
= 20µA, V
OUT
= 1V
V
OUT
= V
POK
= 5.5V
2.93
1.1
2.97
1.12
0.03
0.01
3.02
1.14
0.4
1
V
V
V
µA
I
AO
= 20µA
V
AIN
= 1.5V
10µA < I
AO
= 100µA
V
AIN
= 0.7V, I
AO
= 100µA
V
AIN
= 1.5V, V
AO
= 5.5V
1.237
-30
5
9
0.1
0.01
1.25
1.263
30
16
0.4
1
V
nA
mmho
V
µA
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1700/MAX1701
_______________________________________________________________________________________
3
1-Cell to 3-Cell, High-Power (1A),
Low-Noise, Step-Up DC-DC Converters
MAX1700/MAX1701
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
= -40°C to +85°C, unless otherwise noted.) (Note 8)
PARAMETER
DC-DC CONVERTER
Output Voltage (Note 3)
FB Regulation Voltage
Output Voltage Lockout
Threshold
Supply Current in Shutdown
Supply Current in Low-Power
Mode (Note 6)
Supply Current in Low-Noise
Mode (Note 6)
DC-DC SWITCHES
Switch On-Resistance
N-channel
P-channel
N-Channel Current Limit
GAIN BLOCK (MAX1701)
AIN Reference Voltage
Transconductance
POWER-GOOD (MAX1701)
Internal Trip Level
External Trip Level
LBN, LBP Input Offset
LBN, LBP Common Mode
Range
REFERENCE
Reference Output Voltage
I
REF
= 0
1.23
1.27
V
Rising V
OUT
, V
FB
< 0.1V
Rising V
FB
LBP falling, 15mV hysteresis
To maintain input offset < ±5mV (at least one input must
be within this range)
2.92
1.1
-5
0.5
3.03
1.14
5
1.5
V
V
mV
V
I
AO
= 20µA
10µA < I
AO
< 100µA
1.23
5
1.27
16
V
mmho
CLK/SEL = OUT
CLK/SEL = GND
1100
250
CLK/SEL = GND
CLK/SEL = OUT
0.45
0.28
0.5
1800
600
mA
Ω
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
(Note 4)
V
ONB
= 3.6V
CLK/SEL = GND (MAX1700)
CLK/SEL = GND (MAX1701)
CLK/SEL = OUT (MAX1700)
CLK/SEL = OUT (MAX1701)
3.17
1.20
2.0
3.38
1.27
2.3
20
70
110
250
300
V
V
V
µA
µA
µA
CONDITIONS
MIN
TYP
MAX
UNITS
LOW-BATTERY COMPARATOR (MAX1701)
4
_______________________________________________________________________________________
1-Cell to 3-Cell, High-Power (1A),
Low-Noise, Step-Up DC-DC Converters
ELECTRICAL CHARACTERISTICS (continued)
(CLK/SEL = ONA =
ONB
= FB = PGND = GND, OUT = POUT, V
OUT
= 3.6V, MAX1701: AIN = LBN = GND, LBP = REF,
T
A
= -40°C to +85°C, unless otherwise noted.) (Note 8)
PARAMETER
LOGIC AND CONTROL INPUTS
Input Low Voltage (Note 7)
Input High Voltage (Note 7)
Input High Voltage (Note 7)
Logic Input Current
Internal Oscillator Frequency
Oscillator Maximum Duty Cycle
External Clock Frequency
Range
1.2V < V
OUT
< 5.5V, ONA and
ONB
2.5V < V
OUT
< 5.5V, CLK/SEL
1.2V < V
OUT
< 5.5V, ONA and
ONB
2.5V < V
OUT
< 5.5V, CLK/SEL
ONA,
ONB,
and CLK/SEL
CLK/SEL = OUT
0.8V
OUT
0.8V
OUT
-1
260
80
200
1
340
92
400
0.2V
OUT
0.2V
OUT
V
V
µA
kHz
%
kHz
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1700/MAX1701
Note 1:
Operating voltage. Since the regulator is bootstrapped to the output, once started it will operate down to 0.7V input.
Note 2:
Start-up is tested with the circuit of Figure 2.
Note 3:
In low-power mode (CLK/SEL = GND), the output voltage regulates 1% higher than low-noise mode (CLK/SEL = OUT or
synchronized).
Note 4:
The regulator is in start-up mode until this voltage is reached. Do not apply full load current.
Note 5:
Load regulation is measured from no-load to full load where full load is determined by the N-channel switch current limit.
Note 6:
Supply current from the 3.30V output is measured between the 3.30V output and the OUT pin. This current correlates
directly to the actual battery supply current, but is reduced in value according to the step-up ratio and efficiency. Set V
OUT
= 3.6V to keep the internal switch open when measuring the current into the device.
Note 7:
ONA and
ONB
have hysteresis of approximately 0.15xV
OUT
.
Note 8:
Specifications to -40°C are guaranteed by design and not production tested.
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
MAX1701
SHUTDOWN CURRENT
vs. INPUT VOLTAGE (V)
MAX1700-02
MAX1770-03
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 3.3V)
MAX1700-01
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 5V)
100
V
IN
= 3.6V
90
80
70
60
50
V
IN
= 1.2V
V
IN
= 2.4V
7.0
6.0
SHUTDOWN CURRENT (µA)
5.0
4.0
3.0
2.0
1.0
0
0.1
1
10
100
1000
0
1
100
90
EFFICIENCY (%)
80
70
60
50
40
0.1
1
10
100
V
IN
= 1.2V
V
IN
= 2.4V
T = 25°C
EFFICIENCY (%)
T = 85°C
V
IN
= 0.9V
PFM
PWM
1000
T = -40°C
40
30
PFM
PWM
2
3
4
5
6
LOAD CURRENT (mA)
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
_______________________________________________________________________________________
5
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