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PDF MAX1759 Data sheet ( Hoja de datos )
| Número de pieza | MAX1759 | |
| Descripción | Buck/Boost Regulating Charge Pump in MAX | |
| Fabricantes | Maxim Integrated | |
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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.
1 page  
Buck/Boost Regulating
Charge Pump in µMAX
Typical Operating Characteristics (continued)
(Circuit of Figure 1, CIN = 10µF, CX = 0.33µF, COUT = 10µF, VOUT = 3.3V, VIN = 2.5V, TA = +25°C, unless otherwise noted.)
LINE-TRANSIENT RESPONSE
RLOAD = 33Ω
TURN-ON/OFF RESPONSE
(VIN = 4.2V)
RLOAD = 33Ω
VIN = 4.2V
TURN-ON/OFF RESPONSE
(VIN = 2.5V)
RLOAD = 33Ω
VIN = 2.5V
1
2
100µs/div
CH1: VOUT, 20mV/div, AC-COUPLED
CH2: VIN, 1V/div, AC-COUPLED
-4.2V
-2.5V
1
2
3
4
500µs/div
CH1: VOUT,1V/div
CH2: IIN, 200mA/div
CH3: VPOK, 5V/div
CH4: VSHDN, 5V/div
1
2
3
4
500µs/div
CH1: VOUT,1V/div
CH2: IIN, 200mA/div
CH3: VPOK, 5V/div
CH4: VSHDN, 5V/div
Pin Description
PIN NAME
FUNCTION
Open-Drain Power-OK Output. POK is high impedance when output voltage is in regulation. POK sinks current
1
POK
when VFB falls below 1.1V. Connect a 10kΩ to 1MΩ pull-up resistor from POK to VOUT for a logic signal.
Ground POK or leave unconnected if not used. POK is high impedance in shutdown.
2
SHDN
Shutdown Input. Drive high for normal operation; drive low for shutdown mode. OUT is high impedance in
shutdown.
3, 4
IN
Input Supply. Connect both pins together and bypass to GND with a ceramic capacitor (see Capacitor
Selection section).
5 GND Ground. Connect GND to PGND with a short trace.
6 PGND Power Ground. Charge-pump current flows through this pin.
7 CXN Negative Terminal of the Charge-Pump Transfer Capacitor
8
CXP
Positive Terminal of the Charge-Pump Transfer Capacitor
9 OUT Power Output. Bypass to GND with an output filter capacitor.
10
FB
Dual-Mode Feedback. Connect FB to GND for 3.3V output. Connect to an external resistor divider to adjust
the output voltage from 2.5V to 5.5V.
_______________________________________________________________________________________ 5
5 Page 
Buck/Boost Regulating
Charge Pump in µMAX
NOTES
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX1759.PDF ] | |
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