ISL28127_12 Datasheet, PDF (40/44 Pages) Intersil Corporation – Providing high-performance solutions for every link in the signal chain

Power Management
► Integrated FET Switching Regulators
Boost Regulator
with Integrated
Schottky and Input
Disconnect Switch
Key Features
• Up to 87% Efficiency
• 2.3V to 5.5V Input
• Up to 28V Output
• Integrated Boost Schottky Diode
• Input Voltage Disconnect Switch for
Micro Power Shutdown
• Synchronization Input
• 10 Ld 3x3 DFN Package
• Pb-free (RoHS Compliant)
Single Output Boost Regulators: ISL97701
Up to 2.5W Output Power Delivered in a 3x3mm TDFN
Package
3.2
2.9
2.6
2.3
2.0
1.7
1.4
1.1
0.8
0.5
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
V_IN (V)
Recommended Maximum Output Power vs Input Voltage
A Simple Circuit to Generate Plus and Minus Supplies
Using a Boost Regulator
5V
C0
5µF
VDDOUT
VDD
NEN
NSYNC
GND
L1
10µH
LX
D1
VOUT
Q1
FB
ISL97701
C2
+
-
D2
4.7µF
D3
C3 ^-
+ ^4.7µF
V0
C1 ⁺
4.7µF
-
20.99V
R1
383kΩ
R2
18.2kΩ
ISL28107
5V
V+
+
R3
-
V-
33.2kΩ
R4
100kΩ
- 25.35V
VOUT(positive)
20V
R6
100kΩ
R5
-
V-
+ ^100kΩ
V+
5V
ISL28107
VOUT(negative)
-20V
Reference Design to Generate a Positive and Negative Supply
Single Output Boost Regulators
Device
ISL97701
ISL98012
ISL97516
ISL97519
ISL97519A
ISL97656
Device Description
Boost Regulator with Integrated Schottky
and Input Disconnect Switch
Wide Input Voltage, Adjustable
Frequency Boost Regulator
V_IN Min
(V)
2.3
1.8
V_OUT
V_IN Max Min
(V)
(V)
5.5 1.1 * V_IN
13.2
4.5
V_OUT
Max (V)
28
17
600kHz/1.2MHz PWM Step-Up Regulator 2.3
1% Output Accuracy PWM Step-Up
Regulator with 1.294V Reference
2.3
1% Output Accuracy PWM Step-Up
Regulator with 1.24V Reference
2.3
High Current PWM Step-Up Regulator
with 1.24V Reference
2.3
5.5 1.1* V_IN 25
5.5 1.1* V_IN 25
5.5 1.1* V_IN 25
5.5 1.1* V_IN 25
Boost
Current
Limit (A)
1.2
1.4
2
2
2
4
Feedback
Voltwage &
Accuracy
1.15V
±2.6%
1.33V
±3%
1.294V
-1.7%, +1.15%
1.294V
±1%
1.24V
±1%
1.24V
±1.6%
Features
Integrated Schottky, Low quiescent current and
input disconnect switch for micropower shutdown
Adjustable Soft-Start, 380kHz to 750kHz SF, Low
battery detection
Adjustable Soft-Start, 600kHz/1.2MHz switching
frequency
Adjustable Soft-Start, 620kHz/1.25MHz switching
frequency
Adjustable Soft-Start, 620kHz/1.25MHz switching
frequency
Adjustable Soft-Start, 640kHz/1.22MHz switching
frequency, high output current capability
Package
10 Ld DFN
10 Ld MSOP
8 Ld MSOP
8 Ld MSOP
8 Ld MSOP
10 Ld TDFN
40
Intersil Signal Path Products  2012  www.intersil.com