Datasheet

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General Description

The MAX5008 charge-pump regulator generates a reg-

ulated 5V output up to 125mA with a 2.95V to 5.5V input

voltage range. The device includes resistor-program-

mable overcurrent limit. The MAX5008 requires a mini-

mum number of external components for normal

operation. The high 1MHz switching frequency allows

the use of small surface-mount ceramic capacitors.

The fault-protection circuitry limits the output current

when it exceeds the limit set by an external resistor.

The output current can range from 1mA to 150mA to

accommodate circuit requirements. A FAULT output

indicates when the device is in current limit or the out-

put is out of regulation.

A low-power shutdown mode reduces supply current to

less than 1µA and places the output in a high-imped-

ance state. The MAX5008 is offered in a space-saving

10-pin µMAX

package that is only 1.1mm high.

Applications

Flash Memory Supplies

USB Host Devices

Battery-Powered Systems

3.3V to 5V Local Conversion

Features

♦ Regulated 5V Output Up to 125mA

♦ Indefinite Short-Circuit Protection

♦ Adjustable Output Current Limit

♦ No Inductors Required

♦ 0.1µA Shutdown Current

♦ Thermal Shutdown

♦ Fault Output Indicates Overcurrent or Output

Voltage Out of Regulation

♦ 2.95V to 5.5V Input Voltage Range

♦ 10-Pin µMAX Package

MAX5008

Regulated 5V USB Charge Pump with

Programmable Current Limit

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2426; Rev 1; 7/06

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART TEMP RANGE

PIN-PACKAGE

MAX5008CUB 0°C to +70°C 10 µMAX

FAULT

OUT

200Ω*

0.4Ω

100kΩ

OUT

4.7µF

OUT

EXT

6.8µF

0.68µF

4.7µF

47nF*

2.95V TO 5.5V

CXN

CXP

RCS

CEXT

GND PGND

MAX5008

SHDN

*USE IF PRECISION CURRENT LIMIT IS REQUIRED.

200Ω*

OUT

Typical Operating Circuit

Pin Configuration appears at end of data sheet.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Summary of content (7 pages)

PAGE 1
9-2426; Rev 1; 7/06 Regulated 5V USB Charge Pump with Programmable Current Limit Features The MAX5008 charge-pump regulator generates a regulated 5V output up to 125mA with a 2.95V to 5.5V input voltage range. The device includes resistor-programmable overcurrent limit. The MAX5008 requires a minimum number of external components for normal operation. The high 1MHz switching frequency allows the use of small surface-mount ceramic capacitors.
PAGE 2
MAX5008 Regulated 5V USB Charge Pump with Programmable Current Limit ABSOLUTE MAXIMUM RATINGS IN, SHDN, RCS, FAULT, OUT 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 (VCEXT + 0.3V) CEXT to GND ..........................................-0.3V to (VCEXT + 0.
PAGE 3
Regulated 5V USB Charge Pump with Programmable Current Limit (VIN = SHDN = 3V, CIN = 4.7µF, CX = 0.68µF, CEXT = 6.8µF, COUT = 4.7µF, RCS = 0.4Ω, TA = 0°C to +70°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Thermal Shutdown Junction Temperature 150 °C Thermal Shutdown Hysteresis 30 °C When the input exceeds 4.25V, the power dissipation on the chip exceeds the maximum rating if the output current is 125mA.
PAGE 4
Typical Operating Characteristics (continued) (VIN = 3V, CIN = 4.7µF, CX = 0.47µF, COUT = 4.7µF, CEXT = 4.7µF, RCS = 0.4Ω, TA = +25°C, unless otherwise noted.) EFFICIENCY vs. LOAD CURRENT VIN = 2.95V 90 OUTPUT WAVEFORM SHUTDOWN TIMING MAX5008 toc05 MAX5008 toc06 MAX5008 toc04 100 80 EFFICIENCY (%) MAX5008 Regulated 5V USB Charge Pump with Programmable Current Limit RL = 46Ω 5V VOUT 70 60 VIN = 3.
PAGE 5
Regulated 5V USB Charge Pump with Programmable Current Limit PIN NAME 1 RCS External Current-Sense Resistor. Connect a resistor from RCS to OUT to set the overcurrent threshold. ILIMIT = 60mV / RCS. 2 OUT Fixed 5V Output. Bypass OUT to GND with a 4.7µF capacitor. 3 FAULT 4 GND 5 SHDN 6 PGND 7 CXN 8 IN FUNCTION Output Fault Indicator. FAULT is asserted when either IOUT > ILIMIT or VOUT < VTH. FAULT is an open-drain output that is high during normal operation or during shutdown.
PAGE 6
Regulated 5V USB Charge Pump with Programmable Current Limit MAX5008 Functional Diagram Pin Configuration TOP VIEW CEXT IN RCS CXN OUT SWITCHES CXP CONTROL RCS 1 10 CEXT OUT 2 FAULT 3 GND 4 7 CXN SHDN 5 6 PGND MAX5008 9 CXP 8 IN µMAX MAX5008 PGND FAULT SHDN GND low-impedance trace, and connect the ground for CIN, CEXT, and COUT directly to PGND in a star configuration. Connect RCS to CEXT through a short and low impedance trace.
PAGE 7
Regulated 5V USB Charge Pump with Programmable Current Limit 10LUMAX.EPS e 4X S 10 10 INCHES H Ø0.50±0.1 0.6±0.1 1 1 0.6±0.1 BOTTOM VIEW TOP VIEW D2 MILLIMETERS MAX DIM MIN 0.043 A 0.006 A1 0.002 A2 0.030 0.037 0.120 D1 0.116 0.118 0.114 D2 0.116 0.120 E1 0.118 E2 0.114 0.199 H 0.187 L 0.0157 0.0275 L1 0.037 REF b 0.007 0.0106 e 0.0197 BSC c 0.0035 0.0078 0.0196 REF S α 0° 6° MAX MIN 1.10 0.15 0.05 0.75 0.95 3.05 2.95 3.00 2.89 3.05 2.95 2.89 3.00 4.75 5.05 0.40 0.70 0.940 REF 0.177 0.