XRP7740ILB-F Exar Corporation, XRP7740ILB-F Datasheet - Page 7

• Manufacturer Part Number: XRP7740ILB-F
• Description: IC CTRLR PWM/LDO STP-DWN 40TQFN
• Manufacturer: Exar Corporation
• Type: Step-Down (Buck)r

Specifications of XRP7740ILB-F

• Number Of Outputs: 5
• Package / Case: 40-WFQFN Exposed Pad
• Topology: Step-Down (Buck) (4), Linear (1)
• Function: Standby Power and GPIOs
• Frequency - Switching: 1.5MHz
• Voltage/current - Output 1: 0.9 V ~ 5.1 V, 5A
• Voltage/current - Output 2: 0.9 V ~ 5.1 V, 15A
• Voltage/current - Output 3: 0.9 V ~ 5.1 V, 5A
• W/led Driver: No
• W/supervisor: Yes
• W/sequencer: No
• Voltage - Supply: 6.5 V ~ 20 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Current - Output: 5A, 15A
• Voltage - Output: 0.9 ~ 5.1 V
• Voltage - Input: 6.5 ~ 20 V
• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Switching Frequency: 300 KHz to 1500 KHz
• Operating Supply Voltage: 6.5 V to 20 V
• Supply Current: 50 mA
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Output Voltage: 0.9 V to 5.1 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 1016-1352 - EVAL BOARD FOR XRP77401016-1344 - IN-SOCKET PROG BRD VIA USB/GUI
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 1016-1353

PIN DESCRIPTION
REV 1.1.0
PIN #
QFN
36,31,
16,21
17,22,
30,55
19,24,
28,33
34,29,
23,18
32,27,
20,25
39
38
37
26
10
11
1
2
PIN NAME
BST1-BST4
GH1-GH4
GL1-GL4
LX1-LX4
PGND1-
PGND4
VCCD
DVDD
AGND
VCCA
AVDD
DGND
VIN1
VIN2
EXAR CONFIDENTIAL, PRELIMINARY & PROPRIETARY. DO NOT DISTRIBUTE OR COPY.
EXAR RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET.
Power source for the internal linear regulators to generate VCCA, VDD and the
Standby LDO (LDOOUT). Place a decoupling capacitor close to the controller IC.
Also used in UVLO1 fault generation – if VIN1 falls below the user programmed
limit, all channels are shut down.
board with a short trace.
If the Vin2 pin voltage falls below the user programmed UVLO VIN2 level all
channels are shut down. The VIN2 pin needs to be tied to VIN1 on the board with
a short trace.
Output of the internal 5V LDO. This voltage is internally used to power analog
blocks.
Note that a compensation capacitor should be used on this pin [see Application
Note].
Gate Drive input voltage. This is not an output voltage. This pin can be connected
to VCCA to provide power for the Gate Drive.
VCCD should be connected to VCCA with the shortest possible trace and
decouple with a minimum 1uF capacitor.
Alternatively, VCCD could be connected to an external supply (not greater than
5V).
Power Ground. Ground connection for the low side gate driver.
Output of the internal 1.8V LDO. A decoupling capacitor should be placed between
AVDD and AGND close to the chip (with short traces).
Input for powering the internal digital logic.
AVDD.
Digital Ground. This pin should be connected to the ground plane at the exposed
pad with a separate trace.
Analog Ground. This pin should be connected to the ground plane at the exposed
pad with a separate trace.
Output pin of the low side gate driver. Connect directly to the respective gate of an
external N-channel MOSFET.
Output pin of the high side gate driver. Connect directly to the respective gate of
an external N-channel MOSFET.
Lower supply rail for the high-side gate driver (GHx). Connect this pin to the
switching node at the junction between the two external power MOSFETs and the
inductor. These pins are also used to measure voltage drop across bottom
MOSFETs in order to provide output current information to the control engine.
High side driver supply pin(s). Connect BST to an external boost diode and a
capacitor as shown in the front page diagram.
The high side driver is connected between the BST pin and LX pin.
Quad-Output Digital PWM Buck Controller
7
DESCRIPTION
The VIN1 pin needs to be tied to VIN2 on the
This pin should be connected to
XRP7740