Document
L7292
Five buck regulators power management unit
VQFN 5 x 5 x 0.9 40L
Features
Key specification – Vin range from 2.7 V to 5.5 V
Interface – Two-wire I2C serial interface supports 3.4-Mbit protocol (high speed mode) – 8-bit register bank – Random and Sequential Read modes – Automatic address incrementing
Programmable buck regulators – Regulators with programmable DC set point and soft-start – Buck regulators include integrated PMOS and NMOS switching elements – Up to 90% efficiency – PWM and PFM modes – Two pins to select four sets of DC voltages – ± 1% feedback voltage accuracy – All regulators with auto discharge function on reset. – Programmable bucks
Support functions 128-bit EEPROM for:
– Default Vout – Power up sequence – Reset IC delay time – Regulator enable Integrated voltage monitor with digital filters Thermal protection Package: VQFN 5 x 5 x 0.9 40L
Datasheet - production data
Applications
SSD (Solid-State Drive), portable phone, etc.
Description
The L7292 is a power management device designed for consumer applications. Five bucks provide voltages for the µController and Flash memory with efficiency up to 90% in light-load condition.
The device communicates with the µController via an I2C serial interface operating at clock speeds up to 3.4 Mbit/s.
The regulators operate at 1.3 MHz switching frequency and enter automatically in the PFM operation to maintain high efficiency over the entire load current range.
The device can be forced into the PWM mode by writing a bit in the serial port register.
Low quiescent current (e.g.: All SW reg. ON with no load Iq = 175 µA).
The L7292 device has a DSM mode to reduce the quiescent current at the minimum value (1 x SW reg. ON with no load Iq = 60 µA).
Table 1. Device summary
Regulator
Vout range [V] DC Iload [A]
BUCK1
0.9 - 1.6
1.0
BUCK2 BUCK3 BUCK4 BUCK5
1.5 - 2.1 0.7 - 1.3 0.7 - 1.3 0.7 - 1.3
0.8 0.5 1.0 1.6
November 2015
This is information on a product in full production.
DocID028601 Rev 1
1/60
www.st.com
Contents
Contents
L7292
1 Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
QFN 5 x 5 x 0.9 40L package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5.2 Bias DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5.3 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .