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MAX5008CUB+-MAX5008CUB+T
Regulated 5V USB Charge Pump with Programmable Current Limit
General DescriptionThe 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 FAULToutput
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.
ApplicationsFlash Memory Supplies
USB Host Devices
Battery-Powered Systems
3.3V to 5V Local Conversion
FeaturesRegulated 5V Output Up to 125mAIndefinite Short-Circuit ProtectionAdjustable Output Current LimitNo Inductors Required0.1µA Shutdown CurrentThermal ShutdownFault Output Indicates Overcurrent or Output
Voltage Out of Regulation2.95V to 5.5V Input Voltage Range10-Pin µMAX Package
MAX5008
Regulated 5V USB Charge Pump with
Programmable Current Limit
Ordering Information19-2426; Rev 0; 4/02
Typical Operating Circuit
Pin Configuration appears at end of data sheet.
MAX5008
Regulated 5V USB Charge Pump with
Programmable Current Limit
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(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.)
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.
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+ 0.3V)
Short-Circuit Duration to GND.......................................Indefinite
Continuous Power Dissipation (TA= +70°C)
10-Pin µMAX.................................................................444mW
Operating Temperature Range...............................0°C to +70°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX5008
Regulated 5V USB Charge Pump with
Programmable Current Limit
ELECTRICAL CHARACTERISTICS (continued)(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.)
Note 1:When the input exceeds 4.25V, the power dissipation on the chip exceeds the maximum rating if the output current is 125mA.
Note 2:The MIN/MAX limits are 100% production tested at +25°C and +70°C, and guaranteed by design at 0°C.
Note 3:IOUTis output current flowing from CEXT.
Note 4:The delay from the fault event to the assertion of FAULT. Fault delays are specified with either a current fault or a voltage
fault, but not both simultaneously.
Note 5:The delay from the removal of the fault event to the deassertion of FAULT.
Typical Operating Characteristics(VIN= 3V, CIN= 4.7µF, CX= 0.47µF, COUT= 4.7µF, CEXT= 4.7µF, RCS= 0.4Ω, TA= +25°C, unless otherwise noted.)
MAX5008
Regulated 5V USB Charge Pump with
Programmable Current Limit
EFFICIENCY
vs. LOAD CURRENTMAX5008 toc04
LOAD CURRENT (mA)
EFFICIENCY (%)
200ns/div
OUTPUT WAVEFORM10mV/div
MAX5008 toc05
LINE-TRANSIENT RESPONSEMAX5008 toc07
40µs/div
3.6V
3.1V
A: INPUT VOLTAGE: 500mV/div
B: OUTPUT VOLTAGE: AC-COUPLED, 100mV/div
LOAD-TRANSIENT RESPONSEMAX5008 toc08
40µs/div
100mA
A: LOAD CURRENT
B: OUTPUT VOLTAGE: AC-COUPLED, 100mV/div
10mA
1ms/div
SHUTDOWN TIMINGMAX5008 toc06
VOUT
SHDN
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.)
Detailed DescriptionThe MAX5008 charge pump provides a regulated 5V
output from a 2.95V to 5.5V input. The device delivers a
maximum of 125mA load current. Designed specifically
for compact applications, a complete regulator circuit
requires a minimum number of external components.
Adjustable Current LimitThe MAX5008 has an adjustable overcurrent protec-
tion. An external current-sense resistor is connected
from RCS to OUT to set the current limit. The current
limit is defined by:
ILIMIT= VCS/ RCS
where VCSis the current-sense trip level, typically 60mV.
For example, ILIMIT= 150mA when RCS = 0.40Ω.
When the output current limit is exceeded, the output
voltage falls and the device maintains the average out-
put current at ILIMIT. Upon removal of the overcurrent
condition, the part resumes normal operation.
FAULTIndicationWhen IOUT> ILIMITor VOUT< VTH, FAULTasserts.
FAULTis an open-drain output that needs to be con-
nected through a 100kΩ(typ) pullup resistor to a logic
supply voltage.
Thermal ShutdownThe MAX5008 has internal thermal shutdown circuitry,
which shuts down the device when the die temperature
exceeds +150°C. The thermal shutdown circuitry has
30°C hysteresis.
Shutdown ModeDriving SHDNlow places the device in shutdown
mode, which disables the oscillator, the control logic,
and the reference. The output goes into high-imped-
ance state and drops to ground if loaded. Placing the
device in shutdown mode reduces the supply current
to less than 0.1µA. In normal operation, SHDNis driven
high or connected to IN.
Applications Information
Capacitor Selection The MAX5008 requires four external capacitors. Their
values depend on the required output current. Table 1
shows the capacitor values recommended for different
load currents.
Input Voltage RangeThe MAX5008 maintains a regulated 5V output with
input voltages from 2.95V to 5.5V. If the input voltage
exceeds 4.25V, limit the output current to 75mA or less.
This keeps the MAX5008 within its maximum power dis-
sipation limits.
Layout ConsiderationsAll capacitors should be located as close to the IC as
practical. Connect GND and PGND through a short,
MAX5008
Regulated 5V USB Charge Pump with
Programmable Current Limit
MAX5008low-impedance trace, and connect the ground for CIN,
CEXT, and COUTdirectly to PGND in a star configura-
tion. Connect RCSto CEXTthrough a short and low
impedance trace.
Chip InformationTRANSISTOR COUNT: 2632
PROCESS: BiCMOS
Regulated 5V USB Charge Pump with
Programmable Current Limit
Pin Configuration
