ltc1157cs8-tr Linear Technology Corporation, ltc1157cs8-tr Datasheet

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ltc1157cs8-tr

Manufacturer Part Number
ltc1157cs8-tr
Description
3.3v Dual Micropower High-side/low-side Mosfet Driver
Manufacturer
Linear Technology Corporation
Datasheet
FEATURE
A
TYPICAL
PPLICATI
Notebook Computer Power Management
Palmtop Computer Power Management
P-Channel Switch Replacement
Battery Charging and Management
Mixed 5V and 3.3V Supply Switching
Stepper Motor and DC Motor Control
Cellular Telephones and Beepers
Allows Lowest Drop 3.3V Supply Switching
Operates on 3.3V or 5V Nominal Supplies
3 Microamps Standby Current
80 Microamps ON Current
Drives Low Cost N-Channel Power MOSFETs
No External Charge Pump Components
Controlled Switching ON and OFF Times
Compatible with 3.3V and 5V Logic Families
Available in 8-Pin SOIC
3.3V
LOGIC
3.3V
Ultra Low Voltage Drop 3.3V Dual High-Side Switch
S
A
O
PPLICATI
+
U
10 F
IN1
IN2
S
LTC1157
GND
V
S
O
G1
G2
U
(8.7V)
(8.7V)
IRLR024
LTC1157 • TA01
IRLR024
High-Side/Low-Side MOSFET Driver
LOAD
LOAD
3.3V
3.3V
D
The LTC1157 dual 3.3V micropower MOSFET gate driver
makes it possible to switch either supply or ground
reference loads through a low R
(N-channel switches are required at 3.3V because P-
channel MOSFETs do not have guaranteed R
V
the gate drive voltage 5.4V above the positive rail (8.7V
above ground), fully enhancing a logic level N-channel
switch for 3.3V high-side applications and a standard N-
channel switch for 3.3V low-side applications. The gate
drive voltage at 5V is typically 8.8V above supply (13.8V
above ground), so standard N-channel MOSFET switches
can be used for both high-side and low-side applications.
Micropower operation, with 3 A standby current and
80 A operating current, makes the LTC1157 well suited
for battery-powered applications.
The LTC1157 is available in both 8-pin DIP and SOIC.
GS
ESCRIPTIO
3.3V). The LTC1157 internal charge pump boosts
3.3V Dual Micropower
12
10
6
8
4
2
0
2.0
U
Gate Voltage Above Supply
2.5
3.0
SUPPLY VOLTAGE (V)
3.5
DS(ON)
4.0
4.5
N-channel switch
5.0
LTC1157
LTC1157 • TA02
5.5
DS(ON)
6.0
with
1

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ltc1157cs8-tr Summary of contents

Page 1

FEATURE S Allows Lowest Drop 3.3V Supply Switching Operates on 3. Nominal Supplies 3 Microamps Standby Current 80 Microamps ON Current Drives Low Cost N-Channel Power MOSFETs No External Charge Pump Components Controlled Switching ON and OFF Times ...

Page 2

... V = 3.3V 1000pF S GATE Time for V < 0.5V GATE 1000pF S GATE Time for V < 0.5V GATE ORDER PART TOP VIEW NUMBER GATE 2 LTC1157CS8 IN2 S8 PART MARKING S8 PACKAGE 1157 = 150 LTC1157C MIN TYP MAX 160 180 400 70 15% V ...

Page 3

W U TYPICAL PERFOR A Standby Supply Current IN1 IN2 T = 25° 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 SUPPLY VOLTAGE (V) LTC1157 • ...

Page 4

LTC1157 CTIO S Input Pins: The LTC1157 input pins are active high and activate the charge pump circuitry when switched ON. The LTC1157 logic inputs are high impedance CMOS gates with ESD protection diodes to ...

Page 5

U U APPLICATIO S I FOR ATIO MOSFET Selection The LTC1157 is designed to operate with both standard and logic level N-channel MOSFET switches. The choice of switch is determined primarily by the operating supply voltage. Logic Level MOSFET Switches ...

Page 6

LTC1157 TYPICAL APPLICATIO CONTROL LOGIC OR P 3.3V CONTROL 6 U Ultra Low Drop Cell Dual High-Side Switch 0.47 F CELL BATTERY PACK IN1 G1 CONTROL LTC1157 LOGIC ...

Page 7

... SET 430k Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U Protection, Ramped Output and 3 A Standby Current ...

Page 8

... MIN 0.189 – 0.197 (4.801 – 5.004 0.228 – 0.244 (5.791 – 6.197) SO8 0392 LT/GP 0193 10K REV 0 LINEAR TECHNOLOGY CORPORATION 1993 0.250 ± 0.010 (6.350 ± 0.254) N8 0392 0.150 – 0.157 (3.810 – 3.988) ...

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