ZSPM4011B
High Efficiency 1A Synchronous
Buck Converter
Datasheet
Brief Description
Benefits
The ZSPM4011B is
a
DC/DC synchronous
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Increased battery life
switching regulator with fully integrated power
switches, internal compensation, and full fault
protection. The 1MHz switching frequency enables
using small filter components, resulting in reduced
board space and reduced bill-of-materials costs.
Minimal external component count
(3 capacitors, 1 inductor)
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Inherent fault protection and reporting
Available Support
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The ZSPM4011B utilizes current mode feedback in
normal regulation pulse-width modulation (PWM)
mode. When the regulator is disabled (EN pin is
low), the ZSPM4011B draws less than 10µA quies-
cent current.
Evaluation Kit
Documentation
Physical Characteristics
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Junction operating temperature -40°C to 125°C
Packaged in a 16pin QFN (3x3mm)
The ZSPM4011B integrates a wide range of
protection circuitry, including input supply under-
voltage lockout, output voltage soft start, current
limit, VOUT over-voltage, and thermal shutdown.
The ZSPM4011B includes supervisory reporting
through the PG (Power Good) open drain output to
interface other components in the system.
Related IDT Products
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ZSPM4012B/ZSPM4013B: 2A/3A synchronous
buck converters, available with adjustable out-
put from 0.9 to 5.5V or fixed output voltages at
1.5V, 1.8V, 2.5V, 3.3V, 5.0V
(16-pin 3x3 QFN)
Features
ZSPM1000: >5A single-phase, single-rail, true
digital PWM controller (24-lead 4x4mm QFN)
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Output voltage options (depends on order code):
.
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Fixed output voltages: 1.5V, 1.8V, 2.5V,
3.3V, or 5V with +/- 2% output tolerance
ZSPM4011B Application Circuits
Adjustable output voltage range: 0.9V to
5.5V with +/- 1.5% reference
Adjustable Output
BST
CBST
VCC
CBYPASS
VCC
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Wide input voltage range: 4.5V to 24V
1MHz +/- 10% fixed switching frequency
1A continuous output current
VSW
FB
VOUT
COUT
LOUT
RTOP
RBOT
High efficiency – up to 95%
VOUT
10 kΩ
(optional)
Current mode PWM control with pulse-
frequency modulation (PFM) mode for
improved light load efficiency
EN
EN
PG
PG
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Voltage supervisor for VOUT reported at the PG
pin
Fixed Output
BST
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Input supply under voltage lockout
VCC
VCC
CBST
Soft start for controlled startup with no
overshoot
CBYPASS
VOUT
VSW
LOUT
COUT
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Full protection for over-current, over-
temperature, and VOUT over-voltage
FB
VOUT
10kΩ
(optional)
EN
EN
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Less than 10µA in Disabled Mode
Low external component count
PG
PG
© 2016 Integrated Device Technology, Inc.
1
January 27, 2016