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Si9138

Features: · Up to 95% Efficiency·±3% Total Regulation (Line, Load and Temperature)· 5.5-V to 30-V Input Voltage Range· 3.3-V, 5-V, and Adjustable 5- to 12-V Outputs· Individual ON/OFF Control for 3.3 V and 5 V· 300-kHz Low-Noise Fixed Frequency Operation· Precision 3.3-V Reference Output· 5-V/30-m...

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SeekIC No. : 004490902 Detail

Si9138: Features: · Up to 95% Efficiency·±3% Total Regulation (Line, Load and Temperature)· 5.5-V to 30-V Input Voltage Range· 3.3-V, 5-V, and Adjustable 5- to 12-V Outputs· Individual ON/OFF Control for 3....

Si9138 Data Sheet

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Part Number:
Si9138
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2025/12/25

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Product Details

Description



Features:

· Up to 95% Efficiency
·±3% Total Regulation (Line, Load and Temperature)
· 5.5-V to 30-V Input Voltage Range
· 3.3-V, 5-V, and Adjustable 5- to 12-V Outputs
· Individual ON/OFF Control for 3.3 V and 5 V
· 300-kHz Low-Noise Fixed Frequency Operation
· Precision 3.3-V Reference Output
· 5-V/30-mA Linear Regulator Output
· High Efficiency Pulse Skipping Mode Operation at Light Load
· Only Three Inductors RequiredNo Transformer
· LITTLE FOOT® Optimized Output Drivers
· Internal Soft-Start
· Minimal External Control Components
· 28-Pin SSOP Package
· Output Overvoltage Protection
· Output Undervoltage Shutdown
· Power-Good Output (RESET)




Application

· Notebook and Subnotebook Computers
· PDAs and Mobile Communicators
· Portable Display
· Multimedia Set-Top Box
· Telecommunications Infrastructure
· Network Equipment
· Distributed Power Conversion




Pinout

Connection Diagram




Specifications

VIN to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 to +36 V
PGND to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±2 V
VL to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 to +6.5 V
BST3, BST5, BSTFY to GND . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +36 V
VL Short to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
LX3 to BST3; LX5 to BST5; LXFY to BSTFY . . . . . . . . . . . . . . . 6.5 V to 0.3 V
Inputs/Outputs to GND
(CS3, CS5, CSP, CSN) . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to (VL +0.3 V)
RESET, ON3, ON5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +5.5 V
DL3, DL5, DLFY to PGND . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to (VL +0.3 V)
DH3 to LX3, DH5 to LX5,
DHFY to LXFY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to (BSTx +0.3 V)
Continuous Power Dissipation (TA = 70)a
28-Pin SSOPb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 762 mW
Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 90
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . 40 to 125
Lead Temperature (Soldering, 10 Sec.) . . . . . . . . . . . . . . . . . . . . . . . . . . 300
Notes
a. Device mounted with all leads soldered or welded to PC board.
b. Derate 9.52 mW/ above 70.




Description

The Si9138 is a current-mode PWM and PSM converter controller, with two synchronous buck controllers (3.3 V and 5 V) and an adjustable Buck-Boost controller whose output can be set between 5 and 12 V with an external resistor divider.

Designed for portable devices, it offers a total of five power outputs (three tightly regulated dc/dc converter outputs, a precision 3.3-V reference and a 5-V LDO output) and includes on-board pre-programmed power-up sequencing, power-good signal with delay, internal frequency compensation networks and automatic boot-strapping. It requires minimum external components and is capable of achieving conversion efficiencies approaching 95%.

The Si9138 is available in a 28-pin SSOP package and specified to operate over the extended commercial (0 to 90) temperature range.






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