Document
POWER MANAGEMENT
Features
Input voltage range — 2.3V to 5.5V 1.2A continuous output current 4MHz switching frequency Adjustable Output Voltage 1% output voltage accuracy Adaptive On-Time architecture Up to 100% duty cycle Up to 96% peak efficiency Power Save mode for efficient light load operation >90% efficiency 30mA to 75mA 0.1μA shutdown current 21μA quiescent current Power Good Indicator Pre-bias startup protection Internal soft start 1.5mm x 2mm, 6-Lead MLPD package WEEE and RoHS compliant and halogen-free
Applications
Tablet PCs GPS devices Battery powered equipment Portable devices Smart Phones Wearable Electronics
Typical Application Circuit
SC21152
Tiny 1.2A Synchronous Buck Regulator with Power Good
Description
The SC21152 is an ultra high efficiency 1.2A DC/DC buck regulator available in a small MLPD package. These features make the SC21152 perfect for small form factor consumer applications where high efficiency is essential. SC21152 is an Adaptive On-Time 4MHz switching regulator at full load conditions. Under light load conditions it transitions into PFM Power Save Mode and reduces switching frequency thus saving energy. High switching frequency operation allows the use of a very small 0.47μH inductor along with small input and output capacitors to minimize overall circuit size.
The SC21152 is highly configurable with a wide range of factory options including internal soft start time, fixed or adjustable output voltage, automatic output discharge, and switching frequency.
The SC21152 is offered in a small 6-Lead 1.5mm x 2mm MLPD package.
2.3V-5.5V Supply
Power Good
4.7µF
Fixed Output Voltage
VIN LX
SC21152
1.2A 0.47µH Output
10µF
PG FB
EN EN GND
Adjustable Output Voltage
2.3V-5.5V Supply
Power Good
4.7µF
VIN LX
SC21152
1.2A 0.47µH Output
10µF
PG FB
EN EN GND
Rev 1.0
© 2015 Semtech Corporation
SC21152
Ordering Information
Device (1)(2)
Output(3)
Options(3) Soft Start(3) Output Discharge(3)
Package
SC21152AULTRC Adjustable
100μs
Automatic
1.5mm x 2mm 6-Lead MLPD
SC21152EVB
Evaluation Board 1.5mm x 2.0mm 6-Lead MLPD
Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Lead-free packaging only. Device is WEEE and RoHS compliant and halogen-free. (3) For other device options not shown contact Semtech Marketing. The following options can be made available: VOUT options : adustable and fixed output voltage from 0.8V to 3.6V in 50mV increments. Soft Start options: internal 100μs, 200μs, 400μs, or 800μs. Output Discharge options: Automatic Discharge and No Discharge. Frequency: The default operating frequency is 4MHz with options of 2.2MHz, 3MHz, or 6MHz.
Pin Configuration
Marking Information
1 6 TOP VIEW
2 5 6-Lead MLPD
3
1.5x2.0 (m m )
4
Pin Assignments 6-Lead MLPD
Pin #
Name
1 VIN
2 PG
3 EN
4 FB
5 GND
6 LX
PAD PAD
RCA oyw
TOP VIEW
1.5x2.0 (m m ) 6-Lead MLPD
1.5x2.0 (mm) 6-Lead MLPD Marking Diagram RCA = Device Marking Code
oyw = Pin 1 Indicator and Date Code
SC21152
Absolute Maximum Ratings
VIN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0 EN, FB (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +(VIN+0.3) PG (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VIN+0.3) LX (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +(VIN+0.3) ESD Protection Level (kV)(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Recommended Operating Conditions
Input Voltage Range (V) . . . . . . . . . . . . . . . . . . . . . . . . 2.3 to 5.5 Output Voltage Range, Adjustable VOUT (V) . . . 0.8 to VIN Output Voltage Range, Fixed VOUT (V) . . . . . . . . . . 0.8 to 3.6 Maximum Continuous Current (A). . . . . . . . . . . . . . . . . . . . . 1.2 Junction Temperature Range (°C) . . . . . . . . . -40 < TJ < +125
Thermal Information
Thermal Resistance Junction to Ambient(2) (°C/W )
MLPD package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .120
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +150
Operating Junction Temperature (°C ). . . . . . . -40 to +125
Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . +260
Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not recommended.
NOTES: (1) Tested according to JEDEC standard JESD22-A114-B. (2) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Electrical Characteristics
Unless otherwise noted VIN = 5.0V, CIN = 4.7μF, COUT = 10μF, L = 0.47μH, EN = VIN, TJ = -40 to +125°C. Typical values are at TA = 25°C.
Parameter
Symbol
Condition.