MAX8734AEEI+G104 Maxim Integrated, MAX8734AEEI+G104 Datasheet - Page 16

• Manufacturer Part Number: MAX8734AEEI+G104
• Description: Current & Power Monitors & Regulators High-Efficiency Quad-Output Main Power-Supply Controllers for Notebook Computers
• Manufacturer: Maxim Integrated

Specifications of MAX8734AEEI+G104

• Product: Power Monitors
• Supply Voltage - Max: 24 V
• Supply Voltage - Min: 4.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Accuracy: 1.50%
• Input Voltage Range: 4.5 V to 24 V
• Supply Current: 50 uA

High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
MAX8733A is optimized for “thin and light” applications with
a 5V/400kHz SMPS and a 3.3V/500kHz SMPS. The
MAX8734A provides a pin-selectable switching frequency,
allowing either 200kHz/300kHz or 400kHz/500kHz operation
of the 5V/3.3V SMPSs, respectively.
Light-load efficiency is enhanced by automatic Idle-
Mode operation, a variable-frequency pulse-skipping
mode that reduces transition and gate-charge losses.
Figure 3. Detailed Functional Diagram
16
______________________________________________________________________________________
(MAX8734 ONLY)
(MAX8732A/
MAX8733A)
TON
CS3
BST3
SHDN
ILIM3
OUT3
LDO3
DH3
LX3
ON3
ON5
PRO
DL3
FB3
LDO5
MAX8732A
MAX8733A
MAX8734A
POWER-ON SEQUENCE/
CLEAR FAULT LATCH
LINEAR
REG
3V
EN3
CONTROLLER
SMPS PWM
3.3V
2.91V
GND
V+
Each step-down, the power-switching circuit consists of
two n-channel MOSFETs, a rectifier, and an LC output fil-
ter. The output voltage is the average AC voltage at the
switching node, which is regulated by changing the duty
cycle of the MOSFET switches. The gate-drive signal to
the n-channel, high-side MOSFET must exceed the
battery voltage, and is provided by a flying-capacitor
boost circuit that uses a 100nF capacitor connected
to BST_.
SHUTDOWN
THERMAL
4.56V
CONTROLLER
PGOOD3
SMPS PWM
5V
PGOOD5
LINEAR
EN5
REG
5V
REFERENCE
2V
LDO5
(MAX8732A/
BST5
DH5
LX5
MAX8733A)
V
PGOOD
DL5
ILIM5
FB5
OUT5
LDO5
REF
CC
CS5