MAX5008CUB+ Maxim Integrated Products, MAX5008CUB+ Datasheet - Page 5

• Manufacturer Part Number: MAX5008CUB+
• Description: IC CHARGE PUMP USB 5V 10-UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX5008CUB+

• Applications: Converter, USB
• Voltage - Input: 2.95 ~ 5.5 V
• Number Of Outputs: 1
• Voltage - Output: 5V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Function: Step Up, Step Down
• Output Voltage: 5 V
• Output Current: 140 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The 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.
The 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:
where V
For example, I
When the output current limit is exceeded, the output
voltage falls and the device maintains the average out-
put current at I
condition, the part resumes normal operation.
When I
FAULT is an open-drain output that needs to be con-
nected through a 100k
supply voltage.
The 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.
PIN
10
1
2
3
4
5
6
7
8
9
OUT
CS
is the current-sense trip level, typically 60mV.
> I
LIMIT
FAULT
LIMIT
NAME
LIMIT
SHDN
PGND
CEXT
GND
RCS
OUT
CXN
CXP
IN
_______________________________________________________________________________________
I
LIMIT
= 150mA when RCS = 0.40 .
. Upon removal of the overcurrent
or V
Detailed Description
Adjustable Current Limit
= V
Regulated 5V USB Charge Pump with
(typ) pullup resistor to a logic
OUT
External Current-Sense Resistor. Connect a resistor from RCS to OUT to set the overcurrent
threshold. I
Fixed 5V Output. Bypass OUT to GND with a 4.7µF capacitor.
Output Fault Indicator. FAULT is asserted when either I
open-drain output that is high during normal operation or during shutdown.
Ground Pin. Connect GND to PGND.
Shutdown Input. When SHDN = low, the device turns off. Drive SHDN high or connect to IN for
normal operation.
Power Ground Pin. Connect PGND to GND.
Negative Terminal of the Charge-Pump Capacitor. Connect a 0.68µF capacitor from CXN to CXP.
Input Supply, 2.95V to 5.5V. Bypass IN to GND with a 4.7µF ceramic capacitor.
Positive Terminal of the Charge-Pump Capacitor. Connect a 0.68µF capacitor from CXP to CXN.
Charge-Pump Output. Bypass CEXT to PGND with a 6.8µF capacitor.
CS
/ RCS
< V
Thermal Shutdown
FAULT Indication
TH
LIMIT
, FAULT asserts.
= 60mV / R
Programmable Current Limit
CS
.
Driving SHDN low 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, SHDN is driven
high or connected to IN.
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.
The 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.
All capacitors should be located as close to the IC as
practical. Connect GND and PGND through a short,
Table 1. Recommended Capacitor Values
125mA
50mA
I
OUT
FUNCTION
C
IN
OUT
3.3
4.7
(µF)
Applications Information
> I
LIMIT
C
X
or V
0.33
0.68
(µF)
Layout Considerations
OUT
Input Voltage Range
Capacitor Selection
Pin Description
< V
C
Shutdown Mode
EXT
TH
3.3
6.8
. FAULT is an
(µF)
C
OUT
3.3
4.7
(µF)
5