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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1759 Datasheet

Buck/Boost Regulating Charge Pump in MAX

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19-1600; Rev 0; 1/00
Buck/Boost Regulating
Charge Pump in µMAX
General Description
The MAX1759 is a buck/boost regulating charge pump
that generates a regulated output voltage from a single
lithium-ion (Li+) cell, or two or three NiMH or alkaline
cells for small hand-held portable equipment. The
MAX1759 operates over a wide +1.6V to +5.5V input
voltage range and generates a fixed 3.3V or adjustable
(2.5V to 5.5V) output (Dual Mode™). Maxim’s unique
charge-pump architecture allows the input voltage to be
higher or lower than the regulated output voltage.
Despite its high 1.5MHz operating frequency, the
MAX1759 maintains low 50µA quiescent supply current.
Designed to be an extremely compact buck/boost con-
verter, this device requires only three small ceramic
capacitors to build a complete DC-DC converter capa-
ble of generating a guaranteed 100mA (min) output
current from a +2.5V input. For added flexibility, the
MAX1759 also includes an open-drain power-OK
(POK) output that signals when the output voltage is in
regulation.
The MAX1759 is available in a space-saving 10-pin
µMAX package that is 1.09mm high and half the size of
an 8-pin SO.
Applications
Li+ Battery-Powered Applications
Miniature Equipment
Backup Battery Boost Converters
Translators
Features
o Regulated Output Voltage (Fixed 3.3V or
Adjustable 2.5V to 5.5V)
o 100mA Guaranteed Output Current
o +1.6V to +5.5V Input Voltage Range
o Low 50µA Quiescent Supply Current
o 1µA Shutdown Mode
o Load Disconnected from Input in Shutdown
o High 1.5MHz Operating Frequency
o Uses Small Ceramic Capacitors
o Short-Circuit Protection and Thermal Shutdown
o Small 10-Pin µMAX Package
PART
MAX1759EUB
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
10 µMAX
Typical Operating Circuit
CX
IN
+1.6V TO +5.5V
CXN
IN
CXP
OUT
CIN
MAX1759
ON
OFF
SHDN
POK
FB GND PGND
OUT
3.3V AT 100mA
COUT
POWER OK
TOP VIEW
Pin Configuration
POK 1
SHDN 2
IN 3
IN 4
GND 5
MAX1759
µMAX
10 FB
9 OUT
8 CXP
7 CXN
6 PGND
Dual Mode is a trademark of Maxim Integrated Products.
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1759 Datasheet

Buck/Boost Regulating Charge Pump in MAX

No Preview Available !

Buck/Boost Regulating
Charge Pump in µMAX
ABSOLUTE MAXIMUM RATINGS
IN, OUT, FB, POK, SHDN to GND............................-0.3V to +6V
PGND to GND.....................................................................±0.3V
CXN to GND ................................................-0.3V to (VIN + 0.3V)
CXP to GND..............................................-0.3V to (VOUT + 0.3V)
OUT Short to GND .........................................................Indefinite
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) .........444mW
Operating Temperature Range .......................... -40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................ +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
(Circuit of Figure 1, VIN = V SHDN = 2V, FB = PGND = GND, CIN = 10µF, CX = 0.33µF, COUT = 10µF, TA = 0°C to +85°C, unless oth-
erwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
VIN
1.6 5.5 V
Input Undervoltage Lockout
Voltage
VUVLO
0.6 1.0 1.4
V
Output Voltage Adjustment Range
Output Voltage
VOUT
Maximum Output Current
Transient Load Current
ILOAD,MAX
Quiescent Supply Current
IQ
Shutdown Supply Current
IQ,SHDN
1.6V VIN 5.5V
2V VIN 5.5V, 1mA ILOAD 50mA
2.5V VIN 5.5V, 1mA ILOAD 100mA
2.5V VIN 5.5V
ILOAD 100mA (RMS)
VIN = V SHDN = 4V, VFB = 0, stepping down
VIN = V SHDN = 2V, VFB = 0, stepping up
1.6V VIN 5.5V, V SHDN = 0
2.5 5.5 V
3.17 3.3 3.43
V
3.17 3.3 3.43
100 mA
200 mA
50 90
µA
85 180
1 5 µA
Leakage Current into OUT in
Shutdown
VIN = 2V, VOUT = 3.3V, V SHDN = 0
1 5 µA
SHDN Logic Input Voltage
SHDN Input Leakage Current
FB Regulation Voltage
FB Input Current
FB Dual-Mode Threshold
VIL
VIH
ISHDN
VFB
1.6V VIN 5.5V
1.6V VIN 5.5V
V SHDN = 5.5V
VIN = 1.65V, VOUT = 3.3V
VFB = 1.27V
Internal feedback
External feedback
0.7 · VIN
-1
1.205
200
0.25 · VIN
1.235
25
100
100
1
1.265
200
50
V
µA
V
nA
mV
mV
POK Trip Voltage
Falling edge at FB
1.0 1.1 1.2
V
POK Output Low Voltage
VOL ISINK = 0.5mA, VIN = 2V
5 100 mV
POK Leakage Current
VPOK = 5.5V, VFB = 1.27V
0.01 0.2
µA
Switching Frequency
fOSC 1.6V VIN 5.5V, VFB = 1V
1.2 1.5 1.8 MHz
Output Short-Circuit Current
VOUT = 0, 2.5V VIN 5.5V, foldback current limit
110
mA
Thermal Shutdown Temperature
Rising temperature
160 °C
Thermal Shutdown Hysteresis
20 °C
Efficiency
VIN = 3.6V, ILOAD = 10mA
90 %
2 _______________________________________________________________________________________


Part Number MAX1759
Description Buck/Boost Regulating Charge Pump in MAX
Maker Maxim
Total Page 12 Pages
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