MAX8734AEEI+ Maxim Integrated Products, MAX8734AEEI+ Datasheet - Page 13

• Manufacturer Part Number: MAX8734AEEI+
• Description: IC PWR SUPPLY CONTROLLER 28QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX8734AEEI+

• Applications: Power Supply Controller
• Voltage - Input: 4.5 ~ 24 V
• Current - Supply: 25µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-QSOP
• Product: Power Monitors
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Accuracy: 1.5 %
• Supply Current (max): 50 uA
• Supply Voltage (max): 4.5 V
• Supply Voltage (min): 24 V
• Case: SSOP
• Dc: 06+
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MAX8732A
MAX8733A
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14
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24
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Supply Controllers for Notebook Computers
PIN
High-Efficiency, Quad-Output, Main Power-
MAX8734A
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14
15
16
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22
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24
25
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28
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NAME
LDO5
OUT5
OUT3
LDO3
BST5
BST3
GND
TON
CS5
DH5
DH3
V
DL5
DL3
LX5
LX3
V+
CC
5V SMPS Current-Sense Input. Connect CS5 to a current-sensing resistor from the source of
the synchronous rectifier to GND. The voltage at ILIM5 determines the current-limit threshold
(see the Current-Limit Circuit (ILIM_) section).
Frequency Select Input. Connect to V
400kHz/500kHz operation (5V/3.3V SMPS switching frequencies, respectively).
Boost Flying Capacitor Connection for 5V SMPS. Connect to an external capacitor and diode
according to the typical application circuits (Figure 1 and Figure 2). See the MOSFET Gate
Drivers (DH_, DL_) section.
Inductor Connection for 5V SMPS. LX5 is the internal lower supply rail for the DH5 high-side
gate driver. LX5 is the current-sense input for the 5V SMPS (MAX8734A only).
High-Side MOSFET Floating Gate-Driver Output for 5V SMPS. DH5 swings from LX5 to BST5.
Analog Supply Voltage Input for PWM Core. Connect V
series 50Ω resistor. Bypass to GND with a 1µF ceramic capacitor.
5V Linear-Regulator Output. LDO5 is the gate-driver supply for the external MOSFETs. LDO5
can provide a total of 100mA, including MOSFET gate-drive requirements and external loads.
The internal load depends on the choice of MOSFET and switching frequency (see the
Reference and Linear Regulators (REF, LDO5, and LDO3) section). If OUT5 is greater than
the LDO5 bootstrap switch threshold, the LDO5 regulator shuts down and the LDO5 pin
connects to OUT5 through a 1.4Ω switch. Bypass LDO5 with a minimum of 4.7µF. Use an
additional 1µF per 5mA of load.
5V SMPS Synchronous Rectifier Gate-Drive Output. DL5 swings between GND and LDO5.
Power-Supply Input. V+ powers the LDO5/LDO3 linear regulators and is also used for the
Quick-PWM on-time, one-shot circuits. Connect V+ to the battery input and bypass with a
0.1µF capacitor.
5V SMPS Output Voltage-Sense Input. Connect to the 5V SMPS output. OUT5 is an input to
the Quick-PWM on-time, one-shot circuit. It also serves as the 5V feedback input in fixed-
voltage mode. If OUT5 is greater than the LDO5 bootstrap-switch threshold, the LDO5 linear
regulator shuts down and LDO5 connects to OUT5 through a 1.4Ω switch.
3.3V SMPS Output Voltage-Sense Input. Connect to the 3.3V SMPS output. OUT3 is an input
to the Quick-PWM on-time, one-shot circuit. It also serves as the 3V feedback input in fixed-
voltage mode. If OUT3 is greater than the LDO3 bootstrap-switch threshold, the LDO3 linear
regulator shuts down and LDO3 connects to OUT3 through a 1.5Ω switch.
Analog and Power Ground
3.3V SMPS Synchronous-Rectifier Gate-Drive Output. DL3 swings between GND and LDO5.
3.3V Linear-Regulator Output. LDO3 powers up after REF is in regulation. LDO3 can provide
a total of 100mA to external loads. If OUT3 is greater than the LDO3 bootstrap-switch
threshold, the LDO3 regulator shuts down and the LDO3 pin connects to OUT3 through a
1.5Ω switch. Bypass LDO3 with a minimum of 4.7µF. Use an additional 1µF per 5mA of load.
High-Side MOSFET Floating Gate-Driver Output for 3.3V SMPS. DH3 swings from LX3 to
BST3.
Inductor Connection for 3.3V SMPS. LX3 is the current-sense input for the 3.3V SMPS
(MAX8734A only).
Boost Flying Capacitor Connection for 3.3V SMPS. Connect to an external capacitor and
diode according to the typical application circuits (Figure 1 and Figure 2). See the MOSFET
Gate Drivers (DH_, DL_) section.
CC
for 200kHz/300kHz operation and to GND for
FUNCTION
Pin Description (continued)
CC
to the system supply voltage with a
13